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Event Date Summary
Sarah Shandera (Penn State) Tue. May 9th, 2017
11:00 am-12:00 pm

Cosmological open quantum systems
Our current understanding of the universe relies on an inherently quantum origin for the rich, inhomogeneous structure we see today. Inflation (or any of the alternative proposals for the primordial era) easily generates a universe exponentially larger than what we can observe. …Read more.

Ema Dimastrogiovanni (CWRU) Tue. April 25th, 2017
11:00 am-12:00 pm

Primordial gravitational waves: Imprints and search
Discussed will be some interesting scenarios for the generation of gravitational waves from inflation and the characteristic imprints we can search with upcoming cosmological observations. …Read more.

Matthew Johnson (Perimeter Institute) Tue. April 18th, 2017
11:00 am-12:00 pm

Mapping Ultra Large Scale Structure
Anomalies in the CMB on large angular scales could find an explanation in terms of pre-inflationary physics or intrinsic statistical anisotropies. However, due to cosmic variance it is difficult to conclusively test many of these ideas using the primary cosmic microwave background (CMB) alone. …Read more.

David Chuss (Villanova) Tue. April 11th, 2017
11:00 am-12:00 pm

The Cosmology Large Angular Scale Surveyor (CLASS)
Precise observations of the cosmic microwave background have played a leading role in the development of the LCDM model of cosmology, which has been successful in describing the universe’s energy content and evolution using a mere six parameters. …Read more.

Donghui Jeong (Penn State) Tue. April 4th, 2017
11:00 am-12:00 pm

Non-linearities in large-scale structure: Induced gravitational waves, non-linear galaxy bias
I will present my recent work on non-linearities in large-scale structures of the Universe. For the first part, I will discuss the gauge dependence of the scalar-induced tensor perturbations and its implication on searching the primordial gravitational wave signature from the large-scale structure. …Read more.

Ben Monreal (CWRU) Tue. March 28th, 2017
11:00 am-12:00 pm

Nuclei, neutrinos, and microwaves: searching for the neutrino mass in tritium decay
When Enrico Fermi published his theory of beta decay in 1934—what we now call the weak interaction—he suggested how experiments could measure the neutrino mass: by looking at the shape of the energy distribution of beta decay electrons.   …Read more.

Mauricio Bustamante (CCAPP, OSU) Tue. March 21st, 2017
11:00 am-12:00 pm

Prospecting for new physics with high-energy astrophysical neutrinos

High-energy astrophysical neutrinos, recently discovered by IceCube, are fertile ground to look for new physics.  Due to the high neutrino energies — tens of TeV to a few PeV — we can look for new physics at unexplored energies.  …Read more.

Robert Caldwell (Dartmouth) Tue. March 7th, 2017
11:00 am-12:00 pm

Cosmology with Flavor-Space Locked Fields
We present new models of cosmic acceleration built from a cosmological SU(2) field in a flavor-space locked configuration. We show that such fields are gravitationally birefringent, and absorb and re-emit gravitational waves through the phenomenon of gravitational wave — gauge field oscillations. …Read more.

Matthew Baumgart (Perimeter Institute) Tue. February 14th, 2017
11:00 am-12:00 pm

De Sitter Wavefunctionals and the Resummation of Time
The holographic RG of Anti-De Sitter gives a powerful clue about the underlying AdS/CFT correspondence. The question is whether similar hints can be found for the heretofore elusive holographic dual of De Sitter. …Read more.

Andrew Zentner (Pittsburgh) Tue. February 7th, 2017
11:00 am-12:00 pm

The Power-Law Galaxy Correlation Function
For nearly 40 years, the galaxy-galaxy correlation function has been used to characterize the distribution of galaxies on the sky. In addition, the galaxy correlation function has been recognized as very nearly power-law like despite the fact that it is measured over a wide range of scales. …Read more.

Kurt Hinterbichler (CWRU) Tue. January 31st, 2017
11:00 am-12:00 pm

Partially Massless Higher-Spin Gauge Theory
The higher spin theories of Vasiliev are gauge theories that contain towers of massless particles of all spins, and are thought to be UV complete quantum theories that include gravity, describing physics at energies much higher than the Planck scale. …Read more.

Lucile Savary (MIT) — Michelson Postdoctoral Prize Lecturer Tue. January 24th, 2017
11:00 am-12:00 pm

Quantum Spin Ice
Recent work has highlighted remarkable effects of classical thermal fluctuations in the dipolar spin ice compounds, such as “artificial magnetostatics.” In this talk, I will address the effects of terms which induce quantum dynamics in a range of models close to the classical spin ice point. …Read more.

Lucile Savary (MIT) — Michelson Postdoctoral Prize Lecturer Mon. January 23rd, 2017
4:15 pm-5:15 pm

A New Type of Quantum Criticality in the Pyrochlore Iridates
The search for truly quantum phases of matter is one of the center pieces of modern research in condensed matter physics. …Read more.

Claire Zukowski (Columbia U.) Tue. January 17th, 2017
11:00 am-12:00 pm

Emergent de Sitter Spaces from Entanglement Entropy
A theory of gravity can be holographically “emergent” from a field theory in one lower dimension. In most known cases, the gravitational theory lives in an asymptotically anti- de Sitter spacetime with very different properties from our own de Sitter universe. …Read more.

Beatrice Bonga (Penn State) Tue. December 6th, 2016
11:00 am-12:00 pm

The closed universe and the CMB
Cosmic microwave background (CMB) observations put strong constraints on the spatial curvature via estimation of the parameter $\Omega_k$. This is done assuming a nearly scale-invariant primordial power spectrum. …Read more.

Yi-Zen Chu (University of Minnesota, Duluth) Tue. November 29th, 2016
11:00 am-12:00 pm

Causal Structure Of Gravitational Waves In Cosmology
Despite being associated with particles of zero rest mass, electromagnetic and gravitational waves do not travel solely on the null cone in generic curved spacetimes. …Read more.

Daniel Winklehner (MIT) Tue. November 22nd, 2016
11:00 am-12:00 pm

On the development and applications of high-intensity cyclotrons in neutrino physics and energy research
The cyclotron is one of, if not the, most versatile particle accelerator ever conceived. Based on the (then revolutionary) principle of cyclic acceleration using RF frequency alternating voltage on a so-called dee, while particles are forced into circular orbits by a strong vertical magnetic field, many varieties have been developed in the 84 years since their invention by Lawrence in 1932. …Read more.

Austin Joyce (Kavli Institute for Cosmological Physics, Chicago) Tue. November 15th, 2016
11:00 am-12:00 pm

Soft limits, asymptotic symmetries, and inflation in Flatland
There has been much recent interest in soft limits, both of flat space S-Matrix elements and of cosmological correlation functions. I will discuss the physics probed by soft limits in cosmology and explore the connection between cosmological soft theorems and asymptotic symmetries. …Read more.

Rachel Rosen (Columbia University) Tue. November 8th, 2016
11:00 am-12:00 pm

Non-Singular Black Holes in Massive Gravity
When starting with a static, spherically-symmetric ansatz, there are currently two types of black hole solutions in massive gravity: (i) exact Schwarzschild solutions which exhibit no Yukawa suppression at large distances and (ii) solutions which contain coordinate-invariant singularities at the horizon.  …Read more.

Tao Han (University of Pittsburgh) Fri. November 4th, 2016
11:00 am-12:00 pm

Splitting and showering in the electroweak sector
We derive the splitting functions for the Standard Model electroweak sector at high energies, including the fermions, massive gauge bosons and the Higgs boson. …Read more.

Sean Bryan (Arizona State University) Tue. October 18th, 2016
11:00 am-12:00 pm

Cosmology with Millimeter Wave LEKIDs: CMB, Spectroscopy, and Imaging with TolTEC
Millimeter-wave cameras offer a unique window on the history and dynamics of the universe. Observations of CMB polarization are setting new constraints on cosmic inflation and gravitational lensing. …Read more.

Stacy McGaugh (CWRU Astronomy) [note time] Tue. October 11th, 2016
11:00 am-12:00 pm

*Note that the seminar may be pushed back to 11:30-12:30.
The Radial Acceleration Relation in Rotationally Supported Galaxies
We report a correlation between the radial acceleration traced by rotation curves and that predicted by the observed distribution of baryons. …Read more.

Henriette Elvang (University of Michigan) Tue. September 20th, 2016
11:00 am-12:00 pm

Scattering amplitudes and soft theorems
I will give a pedagogical introduction to the spinor helicity formalism which provides a very efficient tool for studies of on-shell scattering amplitudes in 4 dimensions. …Read more.

Bob Brown (CWRU) Tue. September 13th, 2016
11:00 am-12:00 pm

Understanding Color-Kinematics Duality with a New Symmetry: From Radiation Zeros to BCJ
I discuss a new set of symmetries obeyed by tree-level gauge-theory amplitudes involving at least one gluon. …Read more.

Bryan Lynn (CWRU and University College London) Tue. September 6th, 2016
11:00 am-12:00 pm

Raymond Stora’s last work …Read more.

Excursion Sets, Peaks and Other Creatures: Improved Analytical Models of LSS – Marcello Musso Tue. May 3rd, 2016
11:30 am-12:30 pm

I will present recent developments in analytical methods to predict abundance, clustering, velocities and bias of Dark Matter halos. In the standard analytical approach, halos are identified either with sufficiently high peaks of the initial matter density field, or with the largest spheres enclosing a sufficiently high density. …Read more.

Do We Understand the Universe? – Raul Jimenez Tue. April 26th, 2016
11:30 am-12:30 pm

Observations of the cosmos provide a valuable tool to study the fundamental laws of nature. The future generation of astronomical surveys will provide data for a sizeable fraction of the observable sky. …Read more.

New Directions in Bouncing Cosmologies – Anna M. Ijjas Tue. April 19th, 2016
11:30 am-12:30 pm

In this talk, I will discuss novel ideas to smooth and flatten the universe and generate nearly scale-invariant perturbations during a contracting phase that precedes a cosmological bounce. I will also present some recent work on the possibility of having well-behaved non-singular bounces. …Read more.

Beyond Precision Cosmology – Licia Verde Tue. April 5th, 2016
11:30 am-12:30 pm

The avalanche of data over the past 10-20 years has propelled cosmology into the “precision era”. The next challenge cosmology has to meet is to enter the era of accuracy. Because of the intrinsic nature of studying the Cosmos and the sheer amount of data available and coming, the only way to meet these challenges is by developing suitable and specific statistical techniques. …Read more.

New Approaches to Dark Matter – Justin Khoury Tue. March 29th, 2016
11:30 am-12:30 pm

In this talk I will discuss a novel theory of superfluid dark matter. The scenario matches the predictions of the LambdaCDM model on cosmological scales while simultaneously reproducing the MOdified Newtonian Dynamics (MOND) empirical success on galactic scales. …Read more.

Calibration of the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) Detectors – Madeline Wade Tue. March 22nd, 2016
11:30 am-12:30 pm

Calibration is the critical link between the LIGO detectors and searches for gravitational-wave signals in LIGO data. The LIGO calibration effort involves constructing the external strain incident on each LIGO detector from the digitized readout of the LIGO photodetectors. …Read more.

New Probes of Large-scale CMB Anomalies – Simone Aiola Tue. March 15th, 2016
11:30 am-12:30 pm

Inflation prescribes a homogenous and isotropic universe on large scales, and it generates density fluctuations which are expected to be spatially correlated over the whole Hubble volume. Such fundamental predictions have been tested with current Cosmic Microwave Background (CMB) data and found to be in tension with our — remarkably simple — ΛCDM model. …Read more.

Joining Forces Against the Dark Side of the Universe: The Cosmic Microwave Background and the Large Scale Structure – Shirley Ho Fri. March 4th, 2016
12:30 pm-1:30 pm

Despite tremendous recent progress, gaps remain in our knowledge of our understanding of the Universe. For example, we have yet pinned down the properties of dark energy, nor have we confirmed Einstein’s theory of Gravity at the largest scales. …Read more.

Testing Early Universe Physics with Upcoming Observations – Emanuela Dimastrogiovanni Wed. February 10th, 2016
12:30 pm-1:30 pm

Cosmology has seen tremendous progress thanks to precision measurements and is bound to greatly benefit from upcoming Large Scale Structure and Cosmic Microwave Background data. I will point out a number of interesting directions. …Read more.

New Paradigm for Physics Beyond the Standard Model – Pavel Fileviez Perez Tue. February 9th, 2016
11:30 am-12:30 pm

The great desert hypothesis in particle physics defines the relation between the electroweak scale and the high scale where an unified theory could describes physics. In this talk we review the desert hypothesis and discuss the main experimental constraints from rare decays. …Read more.

Cosmology from the Megaparsec to the Micron – Amol Upadhye Fri. February 5th, 2016
12:30 pm-1:30 pm

Two major challenges for cosmology over the next decade are to characterize the dark energy responsible for the cosmic acceleration and to weigh the neutrinos, the only Standard Model particles whose masses are not yet known. …Read more.

Massive and Partially Massless Gravity and Higher spins – Kurt Hinterbichler Tue. February 2nd, 2016
11:30 am-12:30 pm

On de Sitter space, there exists a special value for the mass of a graviton for which the linear theory propagates 4 rather than 5 degrees of freedom, known as a partially massless graviton. …Read more.

Testing Eternal Inflation – Matthew Johnson Tue. December 8th, 2015
11:30 am-12:30 pm

The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expanding false vacuum. The collision of our bubble with another could provide an important observational signature to test this scenario. …Read more.

Bigravity: Dead or Alive? – Adam Solomon Tue. December 1st, 2015
11:30 am-12:30 pm

Spurred in large part by the discovery of the accelerating universe, recent years have seen tremendous advances in our understanding of alternatives to general relativity, particularly in the large-distance and low-curvature régimes. …Read more.

Bi-gravity from DGP Two-brane Model – Yasuho Yamashita Wed. October 28th, 2015
12:30 pm-1:30 pm

We discuss whether or not bigravity theory can be embedded into the braneworld setup. As a candidate, we consider Dvali-Gabadadze-Porrati two-brane model. We will show that we can construct a ghost free model whose low energy spectrum is composed of a massless graviton and a massive graviton with a small mass, fixing the brane separation with the Goldberger-Wise radion stabilization. …Read more.

The Instability of de Sitter Space and Dynamical Dark Energy: Massless Degrees of Freedom from the Conformal Anomaly in Cosmology – Emil Mottola Tue. October 27th, 2015
11:30 am-12:30 pm

Global de Sitter space is unstable to particle creation, even for a massive free field theory with no self-interactions. The Bunch-Davies state is a definite phase coherent superposition of particle and anti-particle solutions in both the asymptotic past and future, and therefore is not a true vacuum state. …Read more.

Perspectives on WIMP Dark Matter – Pearl Sandick Tue. October 13th, 2015
11:30 am-12:30 pm

The question of the identity of dark matter remains one of the most important outstanding puzzles in modern physics. Weakly Interacting Massive Particles (WIMPs) have long been the frontrunner dark matter candidate, with the supersymmetric neutralino serving as the canonical WIMP. …Read more.

The Standard Model of Particle Physics via Non-Commutative Geometry – Latham Boyle Fri. October 9th, 2015
12:30 pm-1:30 pm

I will introduce Connes’ notion of non-commutative geometry, and explain how it offers a novel geometric perspective on certain otherwise unexplained features of the standard model of particle physics, and a more restrictive framework than effective field theory for exploring physics beyond the standard model. …Read more.

An Anisotropic Universe Due to Dimension-changing False Vacuum Decay – James Scargill Tue. September 29th, 2015
11:30 am-12:30 pm

In this talk I will consider the observational consequences of models of inflation after false vacuum decay in which the parent vacuum has a smaller number of large dimensions than our current vacuum. …Read more.

Prospects for Measuring the Neutron-star Equation of State with Advanced Gravitational-wave Detectors – Leslie Wade Tue. September 22nd, 2015
11:30 am-12:30 pm

It is widely anticipated that the first direct detections of gravitational waves will be made by advanced gravitational-wave detectors, such as the two Laser Interferometer Gravitational-wave Observatories (LIGO) and the Virgo interferometer. …Read more.

Gravitational Signals from Noise in the Hubble Diagram – Edward Macaulay Tue. May 5th, 2015
11:30 am-12:30 pm

Understanding the nature of the dark universe requires precise measurements of the background expansion history, and also the growth rate of density fluctuations. In this talk, I’ll consider both regimes with supernova lensing for the OzDES spectroscopic survey – which is measuring the redshifts of hundreds of supernova and thousands of galaxies identified by the Dark Energy Survey. …Read more.

The Race for the Highest Energy Neutrinos in the Universe – Patrick Allison Tue. April 7th, 2015
11:30 am-12:30 pm

In 1969, Berezinsky and Zatsepin predicted a flux of ultra-high energy (greater than 1 EeV) neutrinos due to cosmic ray interactions with the cosmic microwave background. These ‘cosmogenic’ BZ neutrinos are virtually “guaranteed” – barring extreme changes in either fundamental physics or our understanding of the source of cosmic rays, these neutrinos must exist. …Read more.

Macro Dark Matter – David Jacobs Tue. March 31st, 2015
11:30 am-12:30 pm

Dark matter is a vital component of the current best model of our universe, Lambda-CDM. There are leading candidates for what the dark matter could be (e.g. weakly-interacting massive particles, or axions), but no compelling observational or experimental evidence exists to support these particular candidates, nor any beyond-the-Standard-Model physics that might produce such candidates. …Read more.

Wave Turbulence in Preheating – Henrique de Oliveira Tue. March 24th, 2015
11:30 am-12:30 pm

We have studied the nonlinear preheating dynamics of several inflationary models. They include nonminimally coupled scalar fields and two-fields models. It is well established that after a linear stage of preheating characterized by the parametric resonance, the nonlinear dynamics becomes relevant driving the system towards turbulence. …Read more.

Mapping New Physics with the Cosmic Microwave Background – Jeff McMahon Mon. February 23rd, 2015
11:30 am-12:30 pm

The Cosmic Microwave Background (CMB) is the afterglow of the big bang and the oldest light in the universe that can be observed. Faint signals in the pattern of the CMB provide information about the physics that govern the very early universe and the growth of large scale structure. …Read more.

Optical Frequency Combs and Precision Spectroscopy – Jason Stalnaker Tue. February 17th, 2015
11:30 am-12:30 pm

Atomic spectroscopy has a long history of providing tests of fundamental physics. This tradition continues as the precision and accuracy of spectroscopic techniques improve. I will discuss the impact that the development of stabilized optical frequency combs has had on precision spectroscopy and describe an ongoing effort to study the atomic spectra of lithium at Oberlin College. …Read more.

Numerical Relativity in Spherical Polar Coordinates – Thomas W. Baumgarte Thu. February 12th, 2015
11:30 am-12:30 pm

Numerical relativity simulations have made dramatic advances in recent years. Most of these simulations adopt Cartesian coordinates, which have some very useful properties for many types of applications. Spherical polar coordinates, on the other hand, have significant advantages for others. …Read more.

Is Clustering Dark Energy Non-linear? The AP Resummation Approach – Stefano Anselmi Tue. February 3rd, 2015
11:30 am-12:30 pm

In order to gain insights on the mysterious component driving the acceleration of the Universe the future surveys will measure with unprecedent precision the density power spectrum in the non-linear range of scales and redshifts. …Read more.

Sterile Plus Active Neutrinos and Neutrino Oscillations – Leonard Kisslinger Mon. January 26th, 2015
12:30 pm-1:30 pm

The talk will be based on recent neutrino oscillation experiments that have determined that there is almost certainly a sterile neutrino, with an estimate of the mixing angle. …Read more.

New Accelerators for Neutrino Physics – Matt Toups Tue. January 20th, 2015
11:30 am-12:30 pm

DAEδALUS is a proposed phased neutrino experiment, whose ultimate aim is to search for evidence of CP violation in the neutrino sector. The experiment will consist of several accelerator-based modules that produce decay-at-rest neutrino beams located at three different distances from a single, large underground neutrino detector. …Read more.

The Universe as a Cosmic String – Florian Niedermann Tue. November 25th, 2014
11:30 am-12:30 pm

We are investigating modifications of general relativity that are operative at the largest observable scales. In this context, we are investigating the model of brane induced gravity in 6D, a higher dimensional generalization of the DGP model. …Read more.

Imprints of the Standard Model in the Sky? – Daniel G. Figueroa Tue. November 18th, 2014
11:30 am-12:30 pm

The existence of the Standard Model (SM) Higgs implies that a gravitational wave (GW) background is generated by the decay products of the Higgs, soon after the end of inflation. Theoretically, all Yukawa and SU(2)L gauge couplings of the SM are imprinted as features in the GW spectrum. …Read more.

New Ideas for Dark Energy and Also for Dust Discrimination in B-mode Maps – Marc Kamionkowski Fri. November 14th, 2014
12:30 pm-1:30 pm

…Read more.

Intergalactic Magnetic Fields – Tanmay Vachaspati Tue. November 11th, 2014
11:30 am-12:30 pm

I will describe theoretical motivation for the existence of parity violating (helical) intergalactic magnetic fields and recent and growing observational evidence for such fields. …Read more.

Peaks and Troughs in Large Scale Structure – Ravi K. Sheth Tue. November 4th, 2014
11:30 am-12:30 pm

I will reiew recent and substantial progress in modeling the cosmic web. This progress, which results from merging two different and decades old literature streams, leads to a number of new and interesting insights about how the biased tracers we will observe in the next generation of large scale structure datasets can better constrain cosmological models. …Read more.

High Precision Cosmology with BAO Surveys: BOSS and Future 21cm BAO Surveys – Hee-Jong Seo Fri. October 24th, 2014
12:30 pm-1:30 pm

The large scale structure of matter and galaxies contains important information on the evolution of the Universe. Baryon acoustic oscillations (BAO), which is one of the most promising large scale features, can provide an excellent standard ruler that enables us to measure the cosmological distance scales, and therefore dark energy properties. …Read more.

The Shape of the Electron, and Why It Matters – Amar Vutha Tue. October 14th, 2014
11:30 am-12:30 pm

The universe, or at least the 5% of it that we understand, is described rather well by the Standard Model of particle physics. Yet even this non-dark sector of the universe conceals a great mystery: // where has all the anti-matter gone? …Read more.

Precision Cosmology with Galaxy Surveys: Understanding Intrinsic Alignments and Redshift-space Distortions – Jonathan A. Blazek Fri. October 10th, 2014
12:30 pm-1:30 pm

Galaxy imaging and redshift surveys, designed to measure gravitational lensing and galaxy clustering, remain the most powerful probes of large-scale structure. Such surveys constitute a significant fraction of current and next-generation projects in the cosmology community (e.g. …Read more.

Healthy Theories Beyond Horndeski – Jerome Gleyzes Wed. September 3rd, 2014
11:30 am-12:30 pm

In search for a candidate that could explain the current acceleration of the Universe, a lot of attention has been given recently to Galileon theories, or in their generalized form, Horndeski theories. …Read more.

Interacting Spin-2 Fields – Johannes Noller Tue. September 2nd, 2014
11:30 am-12:30 pm

In this talk I will discuss some recent progress in our understanding of the spin-2 sector, focussing on theories with two or more dynamical such fields. In particular I will highlight the existence of several dualities in such models (generalisations of `Galileon dualities’), their decoupling limit phenomenology as well as the form of their interactions with other matter fields. …Read more.

Recent Progress in Large-Scale Structure – Roman Scoccimarro Fri. May 9th, 2014
11:00 am-12:00 pm

I will discuss recent progress in the understanding of how to model galaxy clustering. While recent analyses have focussed on the baryon acoustic oscillations as a probe of cosmology, galaxy redshift surveys contain a lot more information than the acoustic scale. …Read more.

Atom Interferometry Fundamentals and its Applications in Space Science – Babak Saif Tue. May 6th, 2014
11:30 am-12:30 pm

…Read more.

Shape of the Universe – Daniel Müller Tue. April 29th, 2014
11:30 am-12:30 pm

The most recent observations indicate that the Universe is isotropic, with a small spatial curvature, which can be either positive, negative or zero. As is well known, Einstein’s theory of gravitation restricts the spatially isotropic sections of space time to be locally S^3, H^3 or E^3, respectively. …Read more.

Testing Gravity via Lunar Laser Ranging – Tom Murphy Tue. April 22nd, 2014
11:30 am-12:30 pm

Forty years ago, Apollo astronauts placed the first of several retroreflector arrays on the moon. Laser range measurements between the earth and the moon have provided some of our best tests to date of general relativity and gravitational phenomenology–including the equivalence principle, the time-rate-of-change of the gravitational constant, the inverse square law, and gravitomagnetism. …Read more.

WIMP physics with direct detection – Annika H. G. Peter Tue. April 8th, 2014
11:30 am-12:30 pm

One of the best-motivated classes of dark-matter candidate is the Weakly-Interacting Massive Particle (WIMP). In this talk, I will discuss WIMPs in the context of direct-detection experiments. First, I will discuss a new signal for WIMP dark matter: gravitational focusing in direct-detection experiments. …Read more.

Probing Dark Energy Using Growth of Structure: The Role of Simulations – Hao-Yi Wu Tue. April 1st, 2014
11:30 am-12:30 pm

The growth of cosmic structure provides a unique approach for measuring the dynamic evolution of dark energy and distinguishing different models of gravity. In this talk, I will focus on two of the most important methods for measuring the growth of structure: galaxy cluster counts and the redshift-space distortions of galaxy clustering. …Read more.

Science with CMB Spectral Distortions: a New Window to Early-Universe Physics – Jens Chluba Tue. March 18th, 2014
11:30 am-12:30 pm

Since COBE/FIRAS we know that the CMB spectrum is extremely close to a perfect blackbody. There are, however, a number of processes in the early Universe that should create spectral distortions at a level that is within reach of present day technology. …Read more.

The Marvelous Success of the Standard Model of Cosmology – Lloyd Knox Wed. February 26th, 2014
12:30 pm-1:30 pm

The standard model of cosmology has been remarkably successful in its predictions for current data given earlier data. One can react with sadness for the lack of evidence for new physics, chase marginal anomalies, or marvel at the success and soldier on toward better measurements knowing new physics may be just around the corner. …Read more.

21cm Cosmology – Ue-Li Pen Tue. February 18th, 2014
11:30 am-12:30 pm

I present recent developments in a new window to map the large scale structure of the universe through intensity mapping using the collective unresolved emission of cosmic hydrogen 21cm emission. Initial maps have been made with various existing telescopes, and an ambitious survey, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) is under construction. …Read more.

Cosmology and Systematics of Multi-wavelength Galaxy Cluster Observables – Tomasz Biesiadzinski Tue. February 11th, 2014
11:30 am-12:30 pm

The current concordance lCDM cosmological model describes a universe where cold dark matter seeds structure formation and a cosmological constant drives its accelerated expansion. Precise measurements of various astronomical observables allow us to test this model and any deviations, if found, may lead to an improved cosmological theory. …Read more.

Quantum-Limited Superconducting Detectors and Amplifiers for Cosmology – Philip Mauskopf Fri. February 7th, 2014
12:30 pm-1:30 pm

…Read more.

21-cm Intensity Mapping – Jeffrey Peterson Tue. January 28th, 2014
11:30 am-12:30 pm

…Read more.

Supersymmetry, Non-thermal Dark Matter and Precision Cosmology Tue. December 3rd, 2013
11:30 am-12:30 pm

Within the Minimal Supersymmetric Standard Model (MSSM), LHC bounds suggest that scalar superpartner masses are far above the electroweak scale. Given a high superpartner mass, nonthermal dark matter is a viable alternative to WIMP dark matter generated via freezeout. …Read more.

Cosmic Bandits: Exploration vs. Exploitation in Cosmological Surveys – Ely Kovetz Tue. November 26th, 2013
11:30 am-12:30 pm

Various cosmological observations consist of prolonged integrations over small patches of sky. These include searches for B-modes in the CMB, the power spectrum of 21-cm fluctuations during the epoch of reionization and deep-field imaging by telescopes such as HST/JWST, among others. …Read more.

Turning trajectories in multi-field inflation – Krzysztof Turzyński Tue. November 19th, 2013
11:30 am-12:30 pm

The latest results from the PLANCK collaboration, consistent with the simplest single-field models of slow-roll inflation and with no trace of non-Gaussianity, have extinguished many hopes of seeing specific aspects of New Physics directly in the sky. …Read more.

Lorentz violation in gravity: why, how and where – Diego Blas Mon. November 18th, 2013
3:00 pm-4:00 pm

Recent approaches to quantum gravity question the role of Lorentz invariance as a fundamental symmetry of Nature. This has implications for most of the observables in gravitational physics, also at low-energies. …Read more.

Non-local quantum effects in cosmology – John Donoghue Tue. November 12th, 2013
11:30 am-12:30 pm

In general relativity, there are non-local quantum effects that come from the propagation of light particles including gravitons. I will review the effective field theory treatment which allows one to identify the reliable parts of the quantum loops. …Read more.

Cosmology from conformal symmetry – Austin Joyce Tue. October 29th, 2013
11:30 am-12:30 pm

We will explore the role that conformal symmetries may play in cosmology. First, we will discuss the symmetries underlying the statistics of the primordial perturbations which seeded the temperature anisotropies of the Cosmic Microwave Background. …Read more.

Goldstone bosons with spontaneously broken Lorentz symmetry – Riccardo Penco Tue. October 15th, 2013
11:30 am-12:30 pm

In this talk, I will discuss some general properties of effective theories of Goldstone bosons in which Lorentz symmetry is spontaneously broken. I will first introduce an extension of Goldstone theorem to systems with a finite density of charge. …Read more.

Slavnov-Taylor Identities for Primordial Perturbations – Lasha Berezhiani Tue. October 8th, 2013
11:30 am-12:30 pm

I will show that all consistency relations for the primordial perturbations derive from a single, master identity, which follows from the Slavnov-Taylor identity for spatial diffeomorphisms. This master identity is valid at any value of momenta and therefore goes beyond the soft limit. …Read more.

Symmetry Breaking and Galileons – Garrett Goon Wed. October 2nd, 2013
11:30 am-12:30 pm

Galileons, and related theories, have deep connections to spontaneous symmetry breaking. After reviewing the origins of Galileon theories, I motivate their interpretation as Goldstone Bosons and illustrate some of their special technical properties before proceeding to discuss applications and future directions. …Read more.

CMB Lensing: reconstruction from polarisation & implications for cosmology from cross correlation with galaxies – Ruth Pearson Tue. September 24th, 2013
11:30 am-12:30 pm

CMB Lensing is a probe of the matter distribution between the surface of last scattering and today, which has been measured using CMB temperature data. Signal to noise for lensing reconstruction from CMB polarisation data is expected to be much better, since B modes on small scales should vanish in the absence of lensing. …Read more.

Making the connection between galaxy voids, dark matter underdensities and theory – Paul Sutter Tue. September 10th, 2013
11:30 am-12:30 pm

TBA …Read more.

The Universe in a New Light: the First Cosmological Results from the Planck Mission – Bill Jones Tue. April 30th, 2013
2:30 pm-3:30 pm

The precision and accuracy of the recently released Planck data are without precedent; the data from a single experiment provide all-sky images at wavelengths never before explored, covering more than three decades in angular scale with a signal dynamic range exceeding a factor of a million. …Read more.

Detecting Modified Gravity in the Stars – Jeremy Sakstein Mon. April 29th, 2013
10:30 am-11:30 am

Screened scalar-tensor gravity such as chameleon and symmetron theories allow order one deviations from General Relativity on large scales whilst satisfying all local solar-system constraints. A lot of recent work has therefore focused on searching for observational signatures of these models and constraining them. …Read more.

Senior Project Symposium Sat. April 20th, 2013
11:30 am-12:30 pm

…Read more.

In search for hints of resonance in the CMB power spectrum – Daan Meerburg Tue. April 16th, 2013
11:30 am-12:30 pm

We investigate possible resonance effects in the primordial power spectrum using the latest CMB data. These effects are predicted by a wide variety of models and come in two flavors, one where the oscillations are log spaced and one where the oscillations are linearly spaced. …Read more.

Black Hole Space-Times from S Matrices – Ira Rothstein Tue. April 9th, 2013
11:30 am-12:30 pm

In this talk I will show how to generate classical space-times directly from S matrices. The method makes no use of Einsteins’ equations nor, for that matter, any space-time action at all. …Read more.

Testing gravity with pulsars, black holes and the microwave background – Lam Hui Tue. April 2nd, 2013
11:30 am-12:30 pm

We will discuss 3 topics: 1. a way to detect gravitational waves using binaries; 2. a way to test general relativity using black holes; 3. a way to connect superhorizon fluctuations with the observed statistical asymmetry of the universe. …Read more.

Neutrinoless double beta decay results from EXO-200 – Carter Hall Tue. March 26th, 2013
11:30 am-12:30 pm

Neutrinoless double beta decay has never been definitively observed, although for the last ten years one group has claimed to see a 6-sigma positive effect in 76Ge. Recently the EXO-200 experiment produced the first independent check on this claim using 136Xe. …Read more.

CMB Non-Gaussianity from Recombination and Fingerprints of Dark Matter – Cora Dvorkin Tue. February 26th, 2013
11:30 am-12:30 pm

In this talk, I show that dark matter annihilation around the time of recombination can lead to growing ionization perturbations, that track the linear collapse of matter overdensities. This amplifies small scale cosmological perturbations to the free electron density by a significant amount compared to the usual acoustic oscillations. …Read more.

Odd tensor modes from particle production during inflation – Lorenzo Sorbo Tue. December 4th, 2012
11:30 am-12:30 pm

Several mechanisms can lead to production of particles during primordial inflation. I will review how such a phenomenon occurs and I will discuss how it can lead to the generation of tensor modes with unusual properties that might be detected in the not-so-far future. …Read more.

Advances in Solving the Two-Body Problem in General Relativity: Implications for the Search of Gravitational Waves – Alessandra Buonanno Tue. November 20th, 2012
11:30 am-12:30 pm

Compact binary systems composed of black holes and neutron stars are among the most promising sources for ground-based gravitational-wave detectors, such as the Laser Interferometer Gravitational Wave Observatory (LIGO) and its international partners. …Read more.

Effective Field Theory for Fluids – Rachel Rosen Tue. November 13th, 2012
11:30 am-12:30 pm

In this talk I will present the low-energy effective field theory that describes the infrared dynamics of non-dissipative fluids. In particular, I will use the techniques of non-linear realizations developed by Callan, Coleman, Wess and Zumino, and Volkov to construct the effective theory based on the symmetry-breaking pattern of the fluid. …Read more.

Recent Results from CDMS II and The SuperCDMS Dark-matter Program – Raymond Bunker Tue. November 6th, 2012
11:30 am-12:30 pm

The Cryogenic Dark Matter Search experiment (CDMS II) was designed to directly detect dark matter by simultaneously measuring phonon and ionization signals caused by particle interactions in semiconductor targets, allowing event-by-event discrimination of signal from background via the relative sizes of the two signals. …Read more.

Kicking Chameleons: Early Universe Challenges for Chameleon Gravity – Adrienne Erickcek Tue. October 9th, 2012
11:30 am-12:30 pm

Chameleon gravity is a scalar-tensor theory that mimics general relativity in the Solar System. The scalar degree of freedom is hidden in high-density environments because the effective mass of the chameleon scalar depends on the trace of the stress-energy tensor. …Read more.

A new window on primordial non-Gaussianity – Enrico Pajer Tue. October 2nd, 2012
11:30 am-12:30 pm

We know very little about primordial curvature perturbations on scales smaller than about a Mpc. I review how mu-type distortion of the Cosmic Microwave Background spectrum provides the unique opportunity to probe these scales over the unexplored range from 50 to $104 Mpc-1$. …Read more.

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) – a new tool to probe the dark energy driven expansion history of the universe from z=1-3 – Matt Dobbs Tue. September 25th, 2012
11:30 am-12:30 pm

The most surprising discovery in cosmology since Edwin Hubble observed the expansion of the Universe isthat the rate of this expansion is accelerating. This either signals that a mysterious Dark Energy dominatesthe energy density of the Universe, or that our understanding of gravity on large scales is incorrect. …Read more.

Non-Gaussianity from general inflationary states – Nishant Agarwal Tue. September 18th, 2012
11:30 am-12:30 pm

I will describe the effects of non-trivial initial quantum states for inflationary fluctuations within the context of the effective field theory for inflation. We find that besides giving rise to large non-Gaussianities from inflation, general initial states can also have interesting implications for the consistency relation of the bispectrum. …Read more.

Boosting the Universe: Observational consequences of our motion – Amanda Yoho Tue. September 11th, 2012
11:30 am-12:30 pm

The Cosmic Microwave Background (CMB), photons from the earliest epoch that are able to free stream towards us, provides a unique opportunity to learn about many properties of the universe we live in. …Read more.

The interplay between high and low redshift universe – Azadeh Moradinezhad Dizgah Tue. September 4th, 2012
11:30 am-12:30 pm

Download the slides …Read more.

Supersymmetry, Naturalness, and the LHC: Where Do We Stand? – Matthew Reece Tue. May 1st, 2012
11:30 am-12:30 pm

The LHC has accumulated a large luminosity and has already begun ruling out a wide range of theoretical scenarios. I will discuss the theoretical implications of current LHC searches for supersymmetry and the first tentative Higgs measurements. …Read more.

Gravitational Wave Detection with Pulsars: the NANOGrav collaboration – Dan Stinebring Tue. April 24th, 2012
11:30 am-12:30 pm

The effort to detect long-wavelength gravitational waves with a pulsar timing array (PTA) is progressing well, with three major international groups intensifying their efforts and increasingly sharing data and techniques. *Your* PTA, the North American Nanohertz Observatory for Gravitational waves (NANOGrav) is making excellent progress. …Read more.

Hunting for de Sitter vacua in the String Landscape – Gary Shiu Tue. April 17th, 2012
11:30 am-12:30 pm

Results from observational cosmology suggest that our universe is currently accelerating. The simplest explanation is that we are living in a universe with a positive cosmological constant. In this talk, I will describe some recent attempts in constructing such solutions in string theory and discuss the difficulties one encounters in finding metastable de Sitter vacua. …Read more.

Bosonic and Fermionic Non-thermal Dark Matter Isocurvature Perturbations and Non-Gaussianities – Daniel Chung Tue. April 10th, 2012
11:30 am-12:30 pm

Dark matter candidates in a broad class of non-thermal models produce primordial isocurvature perturbations and non-Gaussianities. We discuss the model dependence of such scenarios. In particular, fermionic superheavy dark matter requires non-gravitational interactions to be observationally interesting. …Read more.

Ghost-free multi-metric interactions Tue. April 3rd, 2012
11:30 am-12:30 pm

The idea that the graviton may be massive has seen a resurgence of interest due to recent progress which has overcome its traditional problems. I will review this recent progress, and show how the theory can be extended to write consistent interactions coupling together multiple massive spin-2 fields. …Read more.

Chromo-Natural Inflation – Peter Adshead Tue. March 27th, 2012
11:30 am-12:30 pm

I will describe a new model for inflation – Chromo-Natural Inflation – consisting of an axionic scalar field coupled to a set of three non-Abelian gauge fields. The model’s novel requirement is that the gauge fields begin inflation with a rotationally invariant vacuum expectation value (VEV) that is preserved through identification of SU(2) gauge invariance with rotations in three dimensions. …Read more.

Testing the concordance cosmology with weak gravitational lensing – Ali Vanderveld Tue. March 20th, 2012
11:30 am-12:30 pm

Weak gravitational lensing, whereby the images of background galaxies are distorted by foreground matter, can be a powerful cosmological probe if systematics are sufficiently controlled. In particular, I will show how we may use weak lensing to robustly test the standard cosmological constant-dominated “concordance model” of cosmology by using in-hand expansion history data to make predictions for future observations. …Read more.

An estimator for statistical anisotropy from the CMB bispectrum – Ema Dimstrogiovanni Tue. February 28th, 2012
11:30 am-12:30 pm

Various data analysis of the Cosmic Microwave Background (CMB) radiation present anomalous features that can be interpreted as indications of statistical isotropy breaking. Some models of inflation involving vector fields predict statistical anisotropy in the correlation functions of primordial curvature perturbations. …Read more.

Local Primordial non-Gaussianity in Large-scale Structure – Marilena LoVerde Tue. February 21st, 2012
11:30 am-12:30 pm

Primordial non-Gaussianity is among the most promising of few observational tests of physics at the inflationary epoch. At present non-Gaussianity is best constrained by the cosmic microwave background, but in the near term large-scale structure data may be competitive so long as the effects of primordial non-Gaussianity can be modeled through the non-linear process of structure formation. …Read more.

Inflation, or What? – William Kinney Tue. February 14th, 2012
11:30 am-12:30 pm

Cosmological inflation is the leading candidate theory for the physics of the early universe, and is in beautiful agreement with current cosmological data such as the WMAP Cosmic Microwave Background measurement. …Read more.

Quantum Kinetics and Thermalization of Hawking Radiation – Dmitry Podolsky Tue. February 7th, 2012
11:30 am-12:30 pm

Hawking’s discovery of black holes radiance along with Bekenstein’s conjecture of the generalized second law of thermodynamics inspired a conceptually pleasing connection between gravity, thermodynamics and quantum theory. However, the discovery that the spectrum of the radiation is in fact thermal, together with the no-hair theorem, has brought along with it some undesirable consequences, most notably the information loss paradox. …Read more.

Condensates and quasiparticles in inflationary cosmology – Daniel Boyanovsky Mon. February 6th, 2012
11:30 am-12:30 pm

Correlation functions during inflation feature infrared effects that could undermine a perturbative study. I will discuss self-consistent mechanisms of mass generation that regulates infrared physics, and introduce a method based on quantum optics to obtain the decay width of quantum states. …Read more.

Gravitational Waves from Cosmological Phase Transitions – Tom Giblin Tue. January 31st, 2012
11:30 am-12:30 pm

Cosmological phase transitions occurred. I will talk about recent advances in modeling possible phase transitions when these transitions are mediated by scalar fields. I will discuss first- and second-order transitions, at various scales, and show how we can compute the background of stochastic gravitational waves produced during (and after) these transitions. …Read more.

Spatially Covariant Theories of a Transverse, Traceless Graviton – Godfrey Miller Tue. January 24th, 2012
11:30 am-12:30 pm

General relativity is a generally covariant, locally Lorentz covariant theory of two transverse, traceless graviton degrees of freedom. According to a theorem of Hojman, Kuchar, and Teitelboim, modifications of general relativity must either introduce new degrees of freedom or violate the principle of local Lorentz covariance. …Read more.

Dark matter bounds from direct and indirect searches – Aravind Natarajan Tue. November 22nd, 2011
11:30 am-12:30 pm

I discuss ways of constraining dark matter properties using a combination of direct and indirect dark matter measurements. The DAMA, CoGeNT, and CRESST experiments have obtained tentative evidence for low mass WIMPs. …Read more.

Light does not always travel on the light cone – Yi-Zen Chu Tue. November 15th, 2011
11:30 am-12:30 pm

Massless particles such as photons and gravitons do not travel solely on the null cone in a generic curved spacetime. They propagate at all speeds equal to and less than c. …Read more.

Holographic Quantum Quench – Sumit Das Fri. November 11th, 2011
11:30 am-12:30 pm

The holographic correspondence between non-gravitational field theories and gravitational theories in one higher dimension can be used to study non-equilibrium behavior of strongly coupled quantum field theories. One such phenomenon is that of quantum quench, where a coupling of the field theory is time dependent and typically asymptotes to constants at early and late times. …Read more.

A Paradise Island for Deformed Gravity – Florian Kuehnel Tue. November 8th, 2011
11:30 am-12:30 pm

I will discuss our recently-proposed model (hep-th/1106.3566) of deformations of general relativity that are consistent and potentially phenomenologically viable, since they respect cosmological backgrounds. These deformations have unique symmetries in accordance with unitarity requirements, and give rise to a curvature induced self-stabilizing mechanism. …Read more.

Measuring the dark sector with clusters of galaxies – Douglas Clowe Tue. November 1st, 2011
11:30 am-12:30 pm

Since Zwicky (1933), we have known that clusters of galaxies have gravitational potentials which are too large to be explained by the amount of visible baryons under the assumption of a Newtonian gravitational force law. …Read more.

Carving Out the Space of Conformal Field Theories – David Simmons-Duffin Fri. October 28th, 2011
11:30 am-12:30 pm

Conformal Field Theories (CFTs) are theories that are symmetric under changes of distance scale, like a fractal or a Russian doll. They are basic building blocks of more general Quantum Field Theories, which can describe how nature works at its most fundamental level. …Read more.

Understanding Chameleon Scalar Fields via Electrostatic Analogy – Kate Jones-Smith Tue. October 18th, 2011
11:30 am-12:30 pm

The late-time accelerated expansion of the universe could be caused by a scalar field that is screened on small scales, as in chameleon or symmetron scenarios. We present an analogy between such scalar fields and electrostatics, which allows calculation of the chameleon field profile for general extended bodies. …Read more.

How Asymmetric Dark Matter May Alter the Conditions of Stardom – Andrew Zentner Tue. September 27th, 2011
11:30 am-12:30 pm

Numerous recent experimental results have reinforced interest in a class of models dubbed “Asymmetric Dark Matter” (ADM), in which the relic dark matter density results from a particle-antiparticle asymmetry. Early models of this sort were invoked to explain the fact that the cosmic baryon and dark matter densities are of the same order, yet in the standard cosmology, they are produced by distinct physical processes. …Read more.

How the genome folds – Erez Lieberman Aiden Fri. September 23rd, 2011
11:30 am-12:30 pm

I describe Hi-C, a novel technology for probing the three-dimensional architecture of whole genomes by coupling proximity-based ligation with massively parallel sequencing. Working with collaborators at the Broad Institute and UMass Medical School, we used Hi-C to construct spatial proximity maps of the human genome at a resolution of 1Mb. …Read more.

Lumps and bumps in the early universe: (p)reheating and oscillons after inflation – Mustafa Amin Tue. September 20th, 2011
11:30 am-12:30 pm

Our understanding of the universe between the end of inflation and production of light elements is incomplete. How did inflation end? What did the universe look like at the end of inflation? …Read more.

Massive gravitons and enhanced gravitational lensing – Mark Wyman Tue. April 26th, 2011
11:30 am-12:30 pm

The mystery of dark energy suggests that there is new gravitational physics at low energies and on long length scales. On the other hand, low mass degrees of freedom in gravity are strictly limited by observations within the solar system. …Read more.

Learning about Aspects of Clusters and Cosmology from Weak and Strong Gravitational Lensing Approaches – Mandeep Gill Tue. April 12th, 2011
11:30 am-12:30 pm

I will cover several aspects of current astrophysics that can be probed by various regimes of lensing in simulations and data –from galaxy cluster substructure to what we can learn about cosmology from cluster weak lensing ensembles. …Read more.

Thick-wall tunneling in a piecewise linear and quadratic potential – Pascal Vaudrevange Tue. April 12th, 2011
11:30 am-12:30 pm

After reviewing the basics of Coleman deLuccia tunneling, especially in the thin-wall limit, I discuss an (almost) exact tunneling solution in a piecewise linear and quadratic potential. A comparison with the exact solution for a piecewise linear potential demonstrates the dependence of the tunneling rate on the exact shape of the potential. …Read more.

Gravitational wave astronomy in the next decade – Xavier Siemens Tue. April 5th, 2011
11:30 am-12:30 pm

In the next decade two types of gravitational wave experiments are expected to result in the direct detection of gravitational waves: Advanced ground-based interferometric detectors and pulsar timing experiments. In my talk I will describe both types of experiments and their sensitivities to various types of gravitational wave sources. …Read more.

Testing Dark Energy with Massive Galaxy Clusters – Michael Mortonson Tue. March 29th, 2011
11:30 am-12:30 pm

Existing observations of the cosmic expansion history place strong restrictions on the rate of large scale structure growth predicted by various dark energy models. In the simplest Lambda CDM scenario, current observations enable percent-level predictions of growth, which can be interpreted in terms of the expected abundance of massive galaxy clusters at high redshift. …Read more.

New observational power from halo bias – Sarah Shandera Tue. March 22nd, 2011
11:30 am-12:30 pm

Non-Gaussianity of the local type will be particularly well constrained by large scale structure through measurements of the power spectra of collapsed objects. Motivated by properties of early universe scenarios that produce observationally large local non-Gaussianity, we suggest a generalized local ansatz and perform N-body simulations to determine the signatures in the bias of dark matter halos. …Read more.

Constraining the cosmic growth history with large scale structure – Rachel Bean Tue. March 15th, 2011
11:30 am-12:30 pm

We consider how upcoming, prospective large scale structure surveys, measuring galaxy weak lensing, position and peculiar velocity correlations, in tandem with the CMB temperature anisotropies, will constrain dark energy when both the expansion history and growth of structure can be modified, as might arise if cosmic acceleration is due to modifications to GR. …Read more.

What to do with 350,000 astronomers – Chris Lintott Fri. February 18th, 2011
11:30 am-12:30 pm

Since its launch in 2007, the Galaxy Zoo project has involved hundreds of thousands of volunteers in the morphological classification of galaxies. Project PI Chris Lintott will review the results – which include a new understanding of the importance of red spirals – and their implications for our understanding of galaxy formation. …Read more.

Astrophysics with Gravitational-Wave Detectors – Vuk Mandic Tue. February 8th, 2011
11:30 am-12:30 pm

Gravitational waves are predicted by the general theory of relativity to be produced by accelerating mass systems with quadrupole moment. The amplitude of gravitational waves is expected to be very small, so the best chance of their direct detection lies with some of the most energetic events in the universe, such as mergers of two neutron stars or black holes, Supernova explosions, or the Big-Bang itself. …Read more.

New and Old Massive Gravity – Claudia de Rham Tue. February 1st, 2011
11:30 am-12:30 pm

TBA …Read more.

A new method for cosmological parameter estimation from Supernovae Type Ia data – Marisa March Tue. January 18th, 2011
11:30 am-12:30 pm

We present a new methodology to extract constraints on cosmological parameters from SNIa data obtained with the SALT lightcurve fitter. The power of our Bayesian method lies in its full exploitation of relevant prior information, which is ignored by the usual chisquare approach. …Read more.

K-essence Interactions with Neutrinos: Flavor Oscillations without Mass – Christopher Gauthier Tue. December 7th, 2010
11:30 am-12:30 pm

In this talk we discuss a novel means of coupling neutrinos to a Lorentz violating background k-essence field. K-essence is a model of dark energy, which uses a non-canonical scalar field to drive the late time accelerated expansion of the universe. …Read more.

Light from Cosmic Strings – Tanmay Vachaspati Tue. November 16th, 2010
11:30 am-12:30 pm

TBA …Read more.

Testing the No-Hair Theorem with Astrophysical Black Holes – Dmitrios Psaltis Tue. November 2nd, 2010
11:30 am-12:30 pm

The Kerr spacetime of spinning black holes is one of the most intriguing predictions of Einstein’s theory of general relativity. The special role this spacetime plays in the theory of gravity is encapsulated in the no-hair theorem, which states that the Kerr metric is the only realistic black-hole solution of the vacuum field equations. …Read more.

Cosmological Constraints from Peculiar Velocities – Arthur Kosowski Fri. October 29th, 2010
11:30 am-12:30 pm

Peculiar velocities of galaxies and clusters are induced during the formation of structure in the universe via gravitational forces. As such, they provide a potentially powerful route to constraining both the growth of structure and the expansion history of the universe. …Read more.

IR issues in Inflation – Richard Holman Fri. October 15th, 2010
11:30 am-12:30 pm

I review some problems involving IR divergences in de Sitter space that give rise to behavior such as secular growth of fluctuations and discuss the use of the Dynamical Renormalization Group as a tool to resum and reinterpret these divergences. …Read more.

The Angular Distribution of the Highest-Energy Cosmic Rays – Andrew Jaffe Tue. October 12th, 2010
11:30 am-12:30 pm

TBA …Read more.

Bulk viscosity and the damping of neutron star oscillations – Mark Alford Fri. October 8th, 2010
11:30 am-12:30 pm

How do we learn about the phases of matter beyond nuclear density? They are to be found only in the interior of neutron stars, which are inaccessible and hard to observe. …Read more.

CMB in a Box – Raul Abramo Tue. September 28th, 2010
11:30 am-12:30 pm

First, I will show that the line-of-sight solution to cosmic microwave anisotropies in Fourier space, even though formally defined for arbitrarily large wavelengths, leads to position-space solutions which only depend on the sources of anisotropies inside the past light-cone of the observer. …Read more.

Does Quantum Mechanics Imply Gravity? – Harsh Mathur Tue. September 21st, 2010
11:30 am-12:30 pm

TBA …Read more.

Galileon Inflation and Non-Gaussianities – Andrew Tolley Tue. September 7th, 2010
11:30 am-12:30 pm

I will discuss a new class of inflationary models based upon the idea of Galileon fields, scalar fields that exhibit non-linearly realized symmetries. These models predict distinctive non-Gaussian features in the primordial power spectrum, and I will discuss how they relate with, and can be distinguished from, canonical inflation, k-inflation, ghost inflation, and DBI-inflationary models. …Read more.

Michelson Lectures — High-Energy Physics with Low-Energy Symmetry Studies – David Hanneke Fri. May 14th, 2010
11:30 am-12:30 pm

Discrete symmetries — charge conjugation (C), parity inversion (P), time reversal (T), and their combinations — provide insight into the structure of our physical theories. Many extensions to the Standard Model predict symmetry violations beyond those already known. …Read more.

Michelson Lectures — Cavity Control in a Single-Electron Quantum Cyclotron: An Improved Measurement of the Electron Magnetic Moment – David Hanneke Thu. May 13th, 2010
11:30 am-12:30 pm

Measurements of the electron magnetic moment (the “g-value”) probe the electron’s interaction with the fluctuating vacuum. With a quantum electrodynamics calculation, they provide the most accurate determination of the fine structure constant. …Read more.

Michelson Lectures — Optical Atomic Clocks – David Hanneke Tue. May 11th, 2010
11:30 am-12:30 pm

The most precise measurement techniques involve time, frequency, or a frequency ratio. For example, for centuries, accurate navigation has relied on precise timekeeping — a trend that continues with today’s global positioning system. …Read more.

Michelson Lectures — Entangled Mechanical Oscillators and a Programmable Quantum Computer: Adventures in Coupling Two-Level Systems to Quantum Harmonic Oscillators – David Hanneke Mon. May 10th, 2010
11:30 am-12:30 pm

The two-level system and the harmonic oscillator are among the simplest analyzed with quantum mechanics, yet they display a rich set of behaviors. Quantum information science is based on manipulating the states of two-level systems, called quantum bits or qubits. …Read more.

Cosmological Bubbles and Solitons: A Classic(al) Effect – Tom Giblin Tue. April 27th, 2010
11:30 am-12:30 pm

Cosmological bubble collisions arising from first order phase transitions are a generic consequence of the Eternal Inflation scenario. I will present our computational strategy for generating and evolving these bubbles in 3+1 dimensions and in a self-consistently expanding background. …Read more.

CP Violation in Bs->J/psi phi: Evidence for New Physics? – Karen Gibson Tue. April 13th, 2010
11:30 am-12:30 pm

CP violation in the Bs->J/psi phi system has been one of the most discussed topics in particle physics in the past two years, in large part due to anomalously high, although statistically limited, measurements of the CP violating phase made by the Tevatron experiments. …Read more.

Quantum Effects in Gravitational Collapse of a Reisner-Nordström Domain wall Tue. April 6th, 2010
11:30 am-12:30 pm

We will investigate the formation of RN black holes by studying the collapse of a charged spherically symmetric domain wall. Utilizing the Functional Schrödinger formalism, we will also investigate time-dependent thermodynamic properties of the collapse and compare with the well known theoretical results. …Read more.

String theory cosmic strings – Dimitri P. Skliros Tue. March 30th, 2010
11:30 am-12:30 pm

I will discuss the first construction of coherent states in the covariant formalism for both open and closed strings with applications to cosmic strings in mind. Furthermore, I provide an explicit map that relates three different descriptions of cosmic strings: classical strings, lightcone gauge quantum states and covariant vertex operators. …Read more.

Tunneling in Flux Compactifications – Jose Blanco-Pillado Tue. March 23rd, 2010
11:30 am-12:30 pm

We identify instantons representing several different transitions in a field theory toy model for string theory flux compactifications and described the observational signatures of such processes. …Read more.

Primordial magnetic fields: evolution and observable signatures – Tina Kahniashvili Tue. March 16th, 2010
11:30 am-12:30 pm

I will discuss the evolution of the primordial magnetic field accounting for MHD instabilities in the early Universe. I will address different cosmological signatures of the primordial magnetic fields and will discuss the observational tests to limit the amplitude and correlation length of the magnetic fields, as well as their detection prospects. …Read more.

ArDM Experiment – Carmen Carmona Tue. March 2nd, 2010
11:30 am-12:30 pm

The Argon Dark Matter (ArDM) project aims at operating a large noble liquid detector to search for direct evidence of Weakly Interacting Massive Particles (WIMP) as Dark Matter in the universe. …Read more.

A Theory Program to Exploit Weak Gravitational Lensing to Constrain Dark Energy – Andrew Zentner Fri. February 26th, 2010
11:30 am-12:30 pm

Weak gravitational lensing is one of the most promising techniques to constrain the dark energy that drives the contemporary cosmic acceleration. I give an overview of the dark energy problem, focusing on the manner in which weak gravitational lensing can determine the nature of the dark energy. …Read more.

Shedding light on the nature of dark matter with gamma-rays – Jennifer Siegal-Gaskins Tue. February 23rd, 2010
11:30 am-12:30 pm

Detection of gamma rays from the annihilation or decay of dark matter particles is a promising method for identifying dark matter, understanding its intrinsic properties, and mapping its distribution in the universe. …Read more.

Non-gaussianities and the Inflationary Initial State – Andrew Tolley Fri. February 19th, 2010
11:30 am-12:30 pm

The potential discovery of primordial non-gaussianities would revolutionize our understanding of early universe cosmology, giving a whole new perspective on the physics responsible for inflation. I will review the different possible physical mechanisms that can give rise to non-gaussianities, and discuss in detail those which are distinctive in telling us about the inflationary quantum state. …Read more.

Dark Matter via Many Copies of the Standard Model – Alex Vikman Tue. February 16th, 2010
11:30 am-12:30 pm

Recently it was realized that the strong coupling scale in gravity substantially depends on the number of different quantum fields present in nature. On the other hand, gravity theory with an electroweak strong coupling scale could be responsible for a solution of the hierarchy problem. …Read more.

Hierarchy in the Phase Space and Dark Matter Astronomy – Niayesh Afshordi Fri. February 12th, 2010
11:30 am-12:30 pm

Understanding small scale structure in the dark matter distribution is important in interpreting many astrophysical observations, as well as dark matter (direct or indirect) detection searches. With this motivation, I introduce a theoretical framework for describing the rich hierarchy of the phase space of cold dark matter haloes, due to gravitationally bound sub-structures, as well as tidal debris and caustics. …Read more.

Shading Lambda – Claudia de Rahm Tue. February 2nd, 2010
11:30 am-12:30 pm

The idea of degravitation is to tackle the cosmological constant problem by modifying gravity at large distances such that a large cosmological constant does not backreact as much as anticipated from standard General Relativity. …Read more.

Dark Matter Substructure in the Milky Way: Properties and Detection Prospects – Louie Strigari Tue. January 26th, 2010
11:30 am-12:30 pm

Cosmological observations have converged on a standard model of Lambda-Cold Dark Matter (LCDM), in which the Universe is dominated by yet unknown components of dark matter and dark energy. When confronted with observations of our own Milky Way, this theory of LCDM leads to the prediction of a significant population of bound, unseen dark matter substructures, ranging possibly from Earth mass scales up to observed dwarf galaxy mass scales. …Read more.

On triviality of $\lambda\phi^{4}$ theory in $D=4$ – Dmitry Podolsky Tue. January 19th, 2010
11:30 am-12:30 pm

e introduce a new non-perturbative method suitable for analyzing scalar quantum field theories at strong coupling based on mapping between quantum field theories in $dS_{D}\times M_{N}$ spacetime and statistical field theories in Euclidean space $M_{N}$. …Read more.

Pulsar Kicks With Active and Sterile Neutrinos – Leonard Kisslinger Fri. December 4th, 2009
11:30 am-12:30 pm

In 2007 my coworkers and I completed the calculation of the velocity given to a neutron star in the period of 10-20 seconds after the gravitational collapse of a massive star by active neutrinos. …Read more.

Nongaussian Fluctuations from Particle Production During Inflation – Neil Barnaby Tue. November 24th, 2009
11:30 am-12:30 pm

In a variety of inflation models, the motion of the inflaton may trigger the production of some iso-curvature particles during inflation, for example via parametric resonance or a phase transition. Inflationary particle production provides a new mechanism for generating cosmological perturbations (infra-red cascading) and can also slow the motion of the inflaton on a steep potential. …Read more.

Gravitational Waves, Laser Interferometers and Multimessenger Astrophysics – Laura Cadonati Tue. November 10th, 2009
11:30 am-12:30 pm

The Laser Interferometer Gravitational-wave Observatory (LIGO) and its sister project Virgo are currently acquiring data, aiming at the first direct detection of gravitational waves. These elusive ripples in the fabric of space-time, carriers of information on the acceleration of large masses, are a key prediction of General Relativity; their detection will activate a fundamental, new probe into the universe. …Read more.

Three thoughts about black holes and cosmology – Latham Boyle Tue. November 3rd, 2009
11:30 am-12:30 pm

I will present three ideas about black holes and cosmology. First, I will discuss a way of understanding the simple patterns which emerge from the notoriously thorny numerical simulations of binary black hole merger, and some of the directions where this understanding may lead. …Read more.

Using anisotropy to identify a dark matter signal in diffuse gamma-ray emission with Fermi – Jennifer Siegal-Gaskins Tue. October 20th, 2009
11:30 am-12:30 pm

Dark matter annihilation in Galactic substructure will produce diffuse gamma-ray emission of remarkably constant intensity across the sky, making it difficult to disentangle this Galactic dark matter signal from the extragalactic gamma-ray background. …Read more.

Measuring small scale CMB temperature and polarization anisotropies with the Atacama Cosmology Telescope – Mike Niemack Fri. October 16th, 2009
11:30 am-12:30 pm

The Atacama Cosmology Telescope (ACT) is a six-meter telescope on the Atacama plateau, Chile that was built to characterize the cosmic microwave background (CMB) with arcminute resolution. Since 2008 ACT has been used to measure the temperature anisotropies in the CMB in three bands between 140 – 300 GHz with the largest arrays of transition-edge sensor (TES) bolometers ever fielded for CMB observations. …Read more.

New Perspectives on Indirect, Astrophysical Dark Matter Limits – Andrew Zentner Fri. October 9th, 2009
11:30 am-12:30 pm

High-Energy neutrinos from the annihilations of dark matter captured within the Sun is thought to be a relatively clean, indirect probe of dark matter physics. In addition, this probe is sensitive to the dark matter-proton cross section so it can be used to cross-check direct searches, and does not rely on a large annihilation cross section in order to be observed in near-term experiments such as IceCube. …Read more.

CMB Polarization Power Spectra from Two Years of BICEP Data – Cynthia Chiang Tue. September 22nd, 2009
11:30 am-12:30 pm

BICEP is a bolometric polarimeter designed to measure the inflationary B-mode polarization of the cosmic microwave background at degree angular scales. During three seasons of observing at the South Pole (2006–2008), BICEP mapped ~2% of the sky chosen to be uniquely clean of polarized foreground emission. …Read more.

Cryogenic Dark Matter Search . Current Results and Future Background Discrimination – Cathy Bailey Tue. May 5th, 2009
11:30 am-12:30 pm

The Cryogenic Dark Matter Search (CDMS) is searching for Weakly Interacting Massive Particles (WIMPs) with cryogenic germanium particle detectors. These detectors discriminate between nuclear recoil candidate and electron recoil background events by collecting both phonon and ionization energy from recoils in the detector crystals. …Read more.

String shots from a spinning black hole – Ted Jacobson Fri. April 24th, 2009
11:30 am-12:30 pm

The dynamics of relativistic current carrying string loops moving axisymmetrically on the background of a Kerr black hole are characterized. In one interesting type of motion, a loop can be ejected along the axis, some internal elastic or rotational kinetic energy being converted into translational kinetic energy. …Read more.

Fundamentals of the LHC – Johan Alwall Tue. April 14th, 2009
11:30 am-12:30 pm

In this introductory lecture I will present why we have built the LHC, and discuss the underlying physics of a hadron collider. This includes the fundamentals of QCD (the theory for the strong interaction), features such as jets and hadronization, and an introduction to the physics of the Standard Model, including Electroweak symmetry breaking. …Read more.

The curvaton inflationary model, non-Gaussianity and isocurvature – Maria Beltran Tue. March 31st, 2009
11:30 am-12:30 pm

The inflationary paradigm has become one of the most compelling candidates to explain the observed cosmological phenomena. However, the data is still inconclusive about the particular details of the inflationary model. …Read more.

Large-Scale Structure in Modified Gravity – Roman Scoccimarro Fri. March 27th, 2009
11:30 am-12:30 pm

Cosmic acceleration may be due to modifications of general relativity (GR) at large scales, rather than dark energy. We use analytic techniques and N-body simulations to find out what observational signatures to expect in brane-induced gravity, with focus on new nonlinear effects not present in GR. …Read more.

Dark Stars – Katie Freese Tue. March 17th, 2009
11:30 am-12:30 pm

We have proposed that the first phase of stellar evolution in the history of the Universe may be Dark Stars (DS), powered by dark matter heating rather than by nuclear fusion. …Read more.

Cascading Gravity and Degravitation – Claudia de Rham Tue. March 3rd, 2009
11:30 am-12:30 pm

Cascading gravity is an explicit realization of the idea of degravitation, where gravity behaves as a high-pass filter. This could explain why a large cosmological constant does not backreact as much as anticipated from standard General Relativity. …Read more.

Testing global isotropy and some interesting cosmological models with CMB – Amir Hajian Tue. February 24th, 2009
11:30 am-12:30 pm

Simplest models of the Universe predict global (statistical) isotropy on large scales in the observable Universe. However there are a number of interesting models that predict existence of preferred directions. In this talk I will present results of using CMB anisotropy maps to test the global isotropy of the Universe on its largest scales, and will show how that can help us constrain interesting models such as topology of the Universe and anisotropic cosmological models (e.g. …Read more.

Hilltop Quintessence – Sourish Dutta Tue. February 17th, 2009
11:30 am-12:30 pm

We examine hilltop quintessence models, in which the scalar field is rolling near a local maximum in the potential, and w is close to -1. We first derive a general equation for the evolution of the scalar field in the limit where w is close to -1. …Read more.

Can the WMAP Haze really be a signature of annihilating neutralino dark matter? – Daniel Cumberbatch Tue. February 3rd, 2009
11:30 am-12:30 pm

Observations by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite have identified an excess of microwave emission from the centre of the Milky Way. It has been suggested that this {\it WMAP haze} emission could potentially be synchrotron emission from relativistic electrons and positrons produced in the annihilations of one (or more) species of dark matter particles. …Read more.

Multi-brane Inflation in String Theory – Amjad Ashoorioon Tue. January 27th, 2009
11:30 am-12:30 pm

I will talk about two inflationary scenarios in which the cooperative behavior of multiple branes give rise to inflation. In the first one, which we call cascade inflation, assisted inflation is realized in heterotic M-theory and by non-perturbative interactions of N M5-branes. …Read more.

High temperature superfluidity in high energy heavy ion collisions at RHIC and forward physics with TOTEM at LHC – Tamas Csorgo Tue. January 13th, 2009
11:30 am-12:30 pm

Five important milestones have been achieved in high energy heavy ion collisions utilitizing the Relativistic Heavy Ion Collider at BNL: – a new phenomena – which was proven to signal a new state of matter – this state of matter was found to be a perfect fluid, with temperatures reaching 2 terakelvins and more – the degrees of freedom were shown to be the quarks – and the kinematic viscosity of this matter at extemely high temperatures were found to be less than that of a superfluid 4He at the onset of superfluidity. …Read more.

Anthropy and entropy – Irit Maor Tue. November 25th, 2008
11:30 am-12:30 pm

TBA …Read more.

On the Challenge to Unveil the Microscopic Nature of Dark Matter – Scott Watson Tue. November 18th, 2008
11:30 am-12:30 pm

Despite the successes of modern precision cosmology to measure the macroscopic properties of dark matter, its microscopic nature still remains elusive. LHC is expected to probe energies relevant for testing theories of electroweak symmetry breaking, and as a result may allow us to produce dark matter for the first time. …Read more.

South Pole Telescope: From conception to first discovery – Zak Staniszewski Tue. October 21st, 2008
11:30 am-12:30 pm

The South Pole Telescope recently discovered three new galaxy clusters in their CMB maps via the Sunyaev Zel’dovich (SZ) effect (Staniszewski et al. 2008). These are the first galaxy clusters discovered using this promising new technique. …Read more.

Primordial Nongaussianity and Large-Scale Structure – Dragan Huterer Fri. October 17th, 2008
11:30 am-12:30 pm

The near-absence of primordial nongaussianity is one of the basic predictions of slow roll, single-field inflation, making measurements of nongaussianity fundamental tests of the physics of the early universe. I first review parametrizations of nongaussianity and briefly review the history of its measurements from the CMB and large-scale structure. …Read more.

In Search of the Coolest White Dwarfs – Evalyn I.Gates Tue. October 14th, 2008
11:30 am-12:30 pm

Cool white dwarf stars are among the oldest objects in the Galaxy. These relics of an ancient stellar population offer a window into the early stages of the galaxy and its formation, and more data on the oldest and coolest white dwarfs may help resolve the interpretation of microlensing searches for MACHOs in the galactic halo. …Read more.

The White Elephant: Upsilon Physics at the BaBar B-factory – Steve Sekula Tue. October 7th, 2008
11:30 am-12:30 pm

For a decade, the PEP-II/BaBar B-factory has been a flagship experiment in precision measurements in the flavor sector, notably in the decays of B and charm mesons. Before its shutdown in April, the B-factory took a new direction and secured the world’s largest samples of Upsilon(3S) and Upsilon(2S) mesons and performed an extensive scan above the Upsilon(4S) resonance. …Read more.

Parameterizing dark energy – Zhiqi Huang Tue. September 16th, 2008
11:30 am-12:30 pm

Dark energy is parameterized by the time evolution of its equation of state $w(z)$. For a very wide class of quintessence (and phantom) dark energy models, we parameterize $w(z)$ with physical quantities related to the scalar field potential and initial conditions. …Read more.

The effect of dark matter halos on reionization and the H21 cm line – Aravind Natarajan Fri. September 5th, 2008
11:30 am-12:30 pm

If much of the dark matter in the Universe consists of WIMPs, their annihilation releases energy, some of which ionizes the IGM. We calculate the contribution to the optical depth due to particle annihilation in early halos. …Read more.

Probing dark energy with cosmology – Roberto Trotta Tue. May 6th, 2008
11:30 am-12:30 pm

In order to pin down the fundamental nature of dark energy, and thus to understand what most of the Universe is actually made of, new and more precise observations are required, along with more efficient and reliable statistical techniques to interpret those observations correctly and to understand the implications they have for our theoretical models of the Universe. …Read more.

Astrophysics and Particle Physics with IceCube – Tyce DeYoung Tue. April 8th, 2008
11:30 am-12:30 pm

The IceCube neutrino observatory under construction at the South Pole is designed to detect high energy (TeV-PeV) neutrino emission from astrophysical objects, such as the sources of galactic and extragalactic cosmic rays. …Read more.

UHECR Phenomenology – Glennys Farrar Tue. March 18th, 2008
11:30 am-12:30 pm

I will review some very general properties that must characterize any relativistic UHECR accelerator, and I will list some key observational constraints on the accelerators. In combination these make it unlikely that any of the conventional source candidates can be solely responsible for the observed cosmic rays about about 60 EeV. …Read more.

Challenging the Cosmological Constant – Nemanja Kaloper Thu. February 28th, 2008
11:30 am-12:30 pm

We outline a dynamical dark energy scenario whose signatures may be simultaneously tested by astronomical observations and laboratory experiments. The dark energy is a field with slightly sub-gravitational couplings to matter, a logarithmic self- interaction potential with a scale tuned to ~ 10 -3 eV, as is usual in quintessence models, and an effective mass m phi influenced by the environmental energy density. …Read more.

Observing Dark Energy with the Next Generation of Galaxy Surveys – Ofer Lahav Tue. February 26th, 2008
11:30 am-12:30 pm

The talk will discuss the design and forecasting for measuring properties of Dark Energy and Dark Matter from new deep imaging surveys, in particular the “Dark Energy Survey” and the DUNE satellite. …Read more.

k-Essence: superluminal propagation, causality and emergent geometry – Alexander Vikman Tue. February 19th, 2008
11:30 am-12:30 pm

K-essence models – scalar field theories with non-quadratic kinetic terms – are considered candidates for dynamical dark energy and inflation. One of the most interesting features of these nonlinear theories is that perturbations around nontrivial backgrounds propagate with a speed different from the speed of light. …Read more.

Physics Beyond the Horizon – Niayesh Afshordi Tue. February 12th, 2008
4:30 pm-5:30 pm

The history of human knowledge is often highlighted by our efforts to explore beyond our apparent horizon. In this talk, I will describe how this challenge has now evolved into our quest to understand the physics at/beyond the cosmological horizon, some twenty orders of magnitude beyond Columbus’s original plan. …Read more.

Demystifying the Large-Scale Structure and Evolution of the Cosmos – Constantinos Skordis Tue. February 5th, 2008
11:30 am-12:30 pm

In the last two decades, cosmology has undergone a revolution, with a large influx of high quality data. There is now a consensus cosmological standard model, Lambda-CDM, based on General Relativity as the theory of gravity, and which requires only about 4% of the energy budget of the universe to be in known baryonic form. …Read more.

Cosmological Unification of String Theories – Simeon Hellerman Fri. January 18th, 2008
1:00 pm-2:00 pm

Recent developments have greatly extended our understanding of quantum gravity in cosmological environments. A new set of exact time-dependent solutions has been found to the equations of motion of string theory, that interpolate among string theories of dramatically different character. …Read more.

The Accelerating Universe: Landscape or Modified Gravity? – Sergei Dubovsky Tue. January 15th, 2008
4:30 pm-5:30 pm

The most remarkable recent discovery in fundamental physics is that the Universe is undergoing accelerated expansion. To achieve a proper understanding of its physical origin forces us to make a hard choice between dynamical and enviromental scenarios. …Read more.

Late Time Behavior of False Vacuum Decay – James Dent Fri. December 7th, 2007
12:30 pm-1:30 pm

The late time behavior of decaying states is examined with regards to its deviation from the usual exponential form of decay. We will look at the origins of this well-established result in quantum mechanics and discuss the issues that arise in a field theory setting. …Read more.

What do WMAP and SDSS really tell about inflation? – Wessel Valkenburg Tue. December 4th, 2007
11:30 am-12:30 pm

We present new constraints on the Hubble function H(phi) and subsequently on the inflationary scalar potential V(phi) from WMAP 3-year data combined with the Sloan Luminous Red Galaxy survey (SDSS-LRG), using a new methodology which appears to be more generic, conservative and model-independent than in most of the recent literature, since it depends neither on the slow-roll approximation, nor on any extrapolation scheme for the potential beyond the observable e-fold range, nor on additional assumptions about initial conditions for the inflaton velocity. …Read more.

Bekenstein-Sanders theory of modified gravity – Constantinos Skordis Tue. November 27th, 2007
11:30 am-12:30 pm

TBA …Read more.

Gravitational Radiation from Supermassive Black Hole Binaries – Andrew Jaffe Tue. November 20th, 2007
11:30 am-12:30 pm

Evidence for Supermassive Black Holes at the centers of galaxy bulges, combined with the paradigm of hierarchical structure formation, implies the existence of binary Supermassive Black Holes. It is expected that these binaries themselves will eventually coalesce in what would be the brightest gravitational-radiation events in the astrophysical universe. …Read more.

Scanning Inflation – Pascal Vaudrevange Tue. November 20th, 2007
11:30 am-12:30 pm

The shapes of the primordial power spectra are the key quantities to unravel the physics of the inflationary epoch. We propose a new framework for parametrizing the spectra of primordial scalar and tensor perturbations, stressing the statistical trajectory nature of the relevant quantities and the importance of priors which can lead to spurious results like an apparent detection of tensor modes. …Read more.

Sterile neutrinos as subdominant warm dark matter – Dan Cumberbatch Tue. November 13th, 2007
11:30 am-12:30 pm

In light of recent findings which seem to disfavor a scenario with (warm) dark matter entirely constituted of sterile neutrinos produced via the Dodelson-Widrow (DW) mechanism, my colleagues and I investigated the constraints attainable for this mechanism by relaxing the usual hypothesis that the relic neutrino abundance must necessarily account for all of the dark matter. …Read more.

Baryogenesis, Electric Dipole Moments, and the Higgs Boson – Michael Ramsey-Musolf Tue. October 30th, 2007
11:30 am-12:30 pm

Explaining the predominance of visible matter over antimatter remains one of the outstanding puzzles at the interface of cosmology with particle and nuclear physics. Although the Standard Model cannot account for the matter-antimatter asymmetry, new physics at the electroweak scale may provide the solution. …Read more.

Gravitational Breakthrough or Experimental Error? – Martin Tajmar Wed. October 24th, 2007
11:30 am-12:30 pm

Accelerometer measurments indicate that a circular field is induced when the rotation rate of a Niobium superconducting ring changes. If found to be genuine, this would be the first-ever gravitational-like field induced by controllable means. …Read more.

Extragalatic Cosmic Rays: a Prescription to Avoid Disaster – Corbin Covault Tue. October 16th, 2007
11:30 am-12:30 pm

The origin of the highest energy cosmic rays has remained a persistent mystery for decades. Now we seem to be on the verge of getting a new handle on where in the universe these things come from. …Read more.

Dark matter, small-scale structure, and dwarf galaxies – Louie Strigari Tue. September 4th, 2007
11:30 am-12:30 pm

The standard model of cold dark matter predicts the existence of thousands of small dark matter halos orbiting the Milky Way, and steep cusps in the central regions of dark matter halos. …Read more.

String Gas Cosmology and Structure Formation – Robert Brandenberger Tue. April 24th, 2007
11:30 am-12:30 pm

Understanding the very early universe is linked inextricably with understanding the resolution of cosmological singularities. I will discuss “string gas cosmology”, one of the approaches making use of string theory to obtain an improved picture of the early universe cosmology. …Read more.

The Origin of the Big Bang: the status of inflation after WMAP – Slava Mukhanov Fri. April 20th, 2007
11:30 am-12:30 pm

I will discuss at a colloquium level the robust model independent predictions of inflation and compare these predictions with the results of the observations of the fluctuations of the cosmic mictrowave background radiation. …Read more.

Prospects for a New Type of High Energy Physics Facility: a Muon Collider – Tom Roberts Fri. April 13th, 2007
11:30 am-12:30 pm

In a few years, after Fermilab’s Tevatron turns off and initial LHC results are available, the High Energy Physics community will be at a crossroads: what type of facility to consider next? …Read more.

Ongoing Mysteries in Astrophysics – Don Driscoll Wed. April 11th, 2007
4:00 pm-5:00 pm

We are at the brink of a Golden Age of Astrophysics with the promise of answers to many long-outstanding questions, including: What is the nature of Dark Matter? What source powers Active Galactic Nuclei? …Read more.

Probability in cosmology: from Bayes theorem to the anthropic principle – Roberto Trotta Tue. March 27th, 2007
11:30 am-12:30 pm

TBA …Read more.

EBEX, a CMB B-mode polarization experiment – Tomotake Matsumura Tue. March 20th, 2007
11:30 am-12:30 pm

I present a balloon-borne cosmic microwave background (CMB) polarization experiment, E and B experiment(EBEX). EBEX is designed, i) to detect or set an upper limit (T/S less than 0.03) on the inflationary gravity-wave background polarization anisotropy signal (primordial B-mode), ii) to measure the CMB polarization anisotropy signal induced by gravitational lensing (lensing B-mode), and iii) to measure galactic dust emission (120 GHz – 450 GHz) in order to monitor foreground contamination. …Read more.

Warped Passages: Unravelling the Mysteries of the Universe’s Hidden Dimensions Tue. March 20th, 2007
5:30 pm-6:30 pm

Host: NOTE: The event is free, but registration is required, at http://www.case.edu/events/dls/register.html …Read more.

Voids of Dark Energy – Sourish Dutta Tue. March 6th, 2007
11:30 am-12:30 pm

The present-day acceleration of the Universe is one of the greatest mysteries of modern cosmology. In the framework of general relativity, the expansion could be caused by either a “cosmological constant”, or a dynamical dark energy component (DDE). …Read more.

Reconstructing dark energy using Maximum Entropy – Caroline Zunckel Fri. March 2nd, 2007
12:30 pm-1:30 pm

Even in what has been termed an age of `precision cosmology’ certain anomalies on a range of astrophysical scales are observed and demand the existence of unseen types of matter or modifications to our current gravitational theory. …Read more.

Do quantum excitations of the inflaton decay? – Cristian Armendariz-Picon Fri. February 16th, 2007
12:30 pm-1:30 pm

The properties of the primordial perturbations seeded during a stage of inflation are determined by the quantum state of the inflaton. This state is usually assumed to be the “vacuum”, since one expects excited states to decay into the state of lowest energy. …Read more.

Cosmic (super)strings: Gravitational wave bursts, stochastic background, and experimental constraints – Xavier Siemens Tue. January 30th, 2007
11:30 am-12:30 pm

I discuss gravitational wave experimental signatures (bursts and stochastic background) of cosmic strings. I will show burst rates that are substantially lower (about a factor of 1000) than previous estimates suggest and explain the disagreement. …Read more.

Quantum cosmology and the conditions at birth of the universe – Serge Winitzki Tue. January 23rd, 2007
11:30 am-12:30 pm

Cosmology ultimately aims to explain the initial conditions at the beginning of time and the entire subsequent evolution of the universe. The “beginning of time” can be understood in the Wheeler-DeWitt approach to quantum gravity, where homogeneous universes are described by a Schroedinger equation with a potential barrier. …Read more.

The life and death of dark matter halos: predictions for neutralino annihilation Tue. December 12th, 2006
11:30 am-12:30 pm

The concordance cosmological model predicts that structures in the Universe form via hierarchical merging, beginning with the smallest dark matter mini-halos. The mass of the smallest halo is set by the initial thermal motion of dark matter particles. …Read more.

Aethereal Gravity – Brendan Foster Tue. December 5th, 2006
11:30 am-12:30 pm

Hints from quantum gravity suggest the existence of a preferred frame. One way to accommodate such a frame in general relativity without sacrificing general covariance is to couple the metric to a dynamical, timelike, unit-norm vector field–the “aether”. …Read more.

The Quintessence Potential: Need for Features and Tracking? – Martin Sahlen Tue. November 28th, 2006
11:30 am-12:30 pm

We reconstruct the potential of a quintessence field from current observational data, including new supernova data, plus information from the cosmic microwave background and from baryon acoustic oscillations. We model the potential using Pade approximant expansions as well as Taylor series, and use observations to assess the viability of the tracker hypothesis. …Read more.

Exploring the Dark Energy Domain – Dragan Huterer Tue. November 21st, 2006
11:30 am-12:30 pm

One of the great mysteries of modern cosmology is the origin and nature of dark energy – a smooth component that contributes about 70% of the total energy density in the universe and causes its accelerated expansion. …Read more.

Probing Dark Energy – Josh Frieman Tue. November 14th, 2006
11:30 am-12:30 pm

TBA …Read more.

Black Hole Formation, Evaporation and the Information Loss Problem – Dejan Stojkovic Tue. October 17th, 2006
11:30 am-12:30 pm

We use the full quantum treatment to study formation of a black hole as seen by an asymptotic observer. Using the Wheeler-de Witt equation to describe a collapsing shell of matter (a spherical domain wall), we show that the black hole takes an infinite time to form in the quantum theory, just as in the classical treatment. …Read more.

Nuclear astrophysics underground – Heide Costantini Tue. October 3rd, 2006
11:30 am-12:30 pm

Cross section measurements for quiescent stellar burning are hampered mainly by extremely low counting rate and cosmic background. Some of the main reactions of H-burning phase have been measured at the LUNA facility (Laboratory for Underground Nuclear Astrophysics) taking advantage of the very low background environment of the Underground Gran Sasso National Laboratory in Italy. …Read more.

Searching for double beta decay with the Enriched Xenon Observatory – Carter Hall Tue. September 26th, 2006
11:30 am-12:30 pm

Neutrinoless double beta decay has recently become a top priority for the global experimental neutrino physics program. Double beta decay has the potential to resolve the scale of the neutrino mass spectrum, and is also the only practical tool we have for understanding the particle/anti- particle nature of the neutrino. …Read more.

Positron annihilations at the Galactic Center: Generating more questions than answers – Hasan Yuksel Tue. September 26th, 2006
11:30 am-12:30 pm

The bulge of our Galaxy is illuminated by the 0.511 MeV gamma-ray line flux from annihilations of nonrelativistic positrons. The emission is strongly concentrated at the Galactic Center, in contrast to gamma-ray maps tracing nucleosynthesis (e.g., the 1.809 MeV line from decaying ^26Al) or cosmic ray processes (e.g., the 1-30 MeV continuum), which reveal a bright disk with a much less prominent central region. …Read more.

Michelson Postdoctoral Prize Lecture – Nicole Bell Mon. May 1st, 2006
11:30 am-12:30 pm

Astrophysical Neutrinos: Revealing Neutrino Properties at the Highest Energies …Read more.

Accelerated expansion from structure formation – Syksy Rasanen Tue. April 4th, 2006
11:30 am-12:30 pm

I discuss the backreaction of inhomogeneities on the expansion of the universe. The average behaviour of an inhomogeneous spacetime is not given by the Friedmann-Robertson-Walker equations. The new terms in the exact equations hold the possibility of explaining the observed acceleration without a cosmological constant or new physics. …Read more.

DEAP and CLEAN Detectors for Low-Energy Particle Astrophysics – Andrew Hime Tue. March 7th, 2006
11:30 am-12:30 pm

The unique properties of scintillation light in liquid neon and liquid argon make possible conceptually simple, massive, and highly sensitive detectors of low-energy solar neutrinos and cosmological dark matter. I will describe the program underway for the design and construction of two novel and complementary detectors dubbed DEAP (Dark matter Experiment with Argon and Pulse shape discrimination) and CLEAN (Cryogenic Low Energy Astrophysics with Neon). …Read more.

In Search of Particle Dark Matter – Dan Hooper Tue. February 28th, 2006
11:30 am-12:30 pm

In recent years, we have learned a great deal about dark matter, but are still ignorant of its identity. The key to uncovering this mystery is likely to lie in some combination of direct and indirect detection techniques, as well as with collider experiments. …Read more.

Galaxy Clustering in the SDSS Redshift Survey – Idit Zehavi Tue. February 21st, 2006
11:30 am-12:30 pm

The ongoing Sloan Digital Sky Survey (SDSS) is providing a wealth of information enabling extensive large-scale structure studies. I will present measurements of galaxy clustering with the SDSS redshift survey, using a sample of about 200,000 galaxies, and concentrating on the two-point correlation function. …Read more.

Cosmogenic Radioisotopes in Low Background Experiments – The WARP Experiment at Gran Sasso – Cristiano Galbiati Tue. January 24th, 2006
11:30 am-12:30 pm

I will discuss results from recent studies on production of radioisotopes by muon-induced showers in neutrino detectors located deep underground. Cosmogenic radioisotopes represent one of the most significant and important classes of background for experiments on solar neutrinos. …Read more.

TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter – Stefano Profumo Tue. November 15th, 2005
11:30 am-12:30 pm

Motivated by the interpretation of the recent results on the TeV gamma radiation from the Galactic center, including the new 2004 HESS data, as a by-product of dark matter particles annihilations, we address the question of the largest possible neutralino masses and pair annihilation cross sections in supersymmetric models. …Read more.

Chaotic Processes in Planet Migration and Orbital Evolution – Fred Adams Tue. November 8th, 2005
11:30 am-12:30 pm

Nearly 150 extrasolar planets have been discovered to date, and their observed orbits display an unexpected diversity. This talk considers a collection of processes for planet migration and orbital evolution, including those operating on a range of time scales. …Read more.

Prospects for Measuring nu-N Coherent Scattering at a Spallation Source Tue. October 18th, 2005
11:30 am-12:30 pm

Coherent neutral current neutrino-nucleus elastic scattering has never been observed. Although the cross-section is very high, nuclear recoil energies are very small. However, detection of the process may be possible for the new generation of low-threshold detectors. …Read more.

On virialization with dark energy – Irit Maor Tue. October 11th, 2005
11:30 am-12:30 pm

We review the inclusion of dark energy into the formalism of spherical collapse, and the virialization of a two-component system, made of matter and dark energy. We compare two approaches in the literature. …Read more.

Prospects for Measuring nu-N Coherent Scattering at a Spallation Source – Kate Scholberg Tue. October 11th, 2005
11:30 am-12:30 pm

Coherent neutral current neutrino-nucleus elastic scattering has never been observed. Although the cross-section is very high, nuclear recoil energies are very small. However, detection of the process may be possible for the new generation of low-threshold detectors. …Read more.

Wormholes, Dark Energy, and the Null Energy Condition – Roman Buniy Tue. October 4th, 2005
11:30 am-12:30 pm

We show that violation of the null energy condition implies instability in a broad class of models, including classical gauge theories with scalar and fermionic matter as well as any perfect fluid. …Read more.

Can black hole events from cosmic rays be observed at the Auger Observatory? – Dejan Stojkovic Tue. September 27th, 2005
11:30 am-12:30 pm

It has been argued that neutrinos originating from ultra-high energy cosmic rays produce black holes deep in the atmosphere in models with TeV-scale quantum gravity. Such black holes would initiate quasi-horizontal showers of particles far above the standard model rate, so that the Auger Observatory would observe hundreds of black hole events. …Read more.

Quantum metric fluctuations in cosmological and black hole spacetimes – Albert Roura Tue. September 20th, 2005
11:30 am-12:30 pm

It is expected that a number of quantum aspects of the gravitational field and its interaction with the remaining matter fields can be studied within a low-energy effective field theory approach provided that the typical scales involved are much larger than the Planck length. …Read more.

What is the Cosmological Significance of a Discovery of Wimps at Colliders or in Direct Experiments? – Jacob Bourjaily Tue. September 13th, 2005
11:30 am-12:30 pm

Although a discovery of wimps either at colliders or indirect experiments would have enormous implications for our understanding of particle physics, it would imply less than one would like about our understanding of the dark matter in the universe or in the galactic halo: it surely is possible that discovered particles account for only a little of the total dark matter. …Read more.

Boundary Localized Symmetry Breaking and Topological Defects – Matthew Martin Fri. May 6th, 2005
11:30 am-12:30 pm

I discuss the structure of topological defects in the context of recent extra dimensional models where the symmetry breaking terms are localized. These defects develop structure in the extra dimension which differs from the case where symmetry breaking is not localized. …Read more.

The Ages of the Oldest Stars – Brian Chaboyer Tue. April 26th, 2005
11:30 am-12:30 pm

The ages of the oldest stars in the Milky Way yield a reliable lower limit to the age of the universe and provide important information on the early formation history of our Galaxy. …Read more.

Gravity and Horizon Entropy – Ted Jacobson Fri. April 8th, 2005
11:30 am-12:30 pm

I will argue that if (i) entanglement entropy density across any surface is a universal finite constant η, and (ii) local Lorentz symmetry holds, then the spacetime metric must satisfy the Einstein equation, with Newton’s constant equal to 1/(4 hbar η). …Read more.

Technique for WIMP dark matter detection using pulse-shape discrimination in noble liquids – Mark Boulay Tue. March 29th, 2005
11:30 am-12:30 pm

It has long been known that a large fraction of our universe is composed of non-luminous or dark matter. The effects of dark matter have been observed since the 1930’s by studying velocity dipersions in galaxy clusters, and several direct searches for particle dark matter are ongoing. …Read more.

Indirect signals from Dark Matter – Francesc Ferrer Fri. March 4th, 2005
11:30 am-12:30 pm

Abstract: The only evidence so far for the presence of Dark Matter in our Galaxy is through its gravitational interactions. Several experiments, however, have recently observed the emission of gamma-rays from the Galactic Center that could be caused by the annihilation of Dark Matter particles. …Read more.

A Geometric approach to Distinguish Between a New Source and Random Fluctuations: Applications to High-Energy Physics – Ramani S. Pilla Fri. February 25th, 2005
11:30 am-12:30 pm

One of the fundamental problems in the analysis of experimental data is determining the statistical significance of a putative signal. Such a problem can be cast in terms of classical “hypothesis testing”, where a null hypothesis describes the background and an alternative hypothesis characterizes the signal as a perturbation of the background. …Read more.

Ultra-high energy neutrinos – Mike Duvernois Tue. February 22nd, 2005
11:30 am-12:30 pm

The search for GZK neutrinos, and its connection to the highest-energy cosmic rays will be discussed. In particular, we’ll look at the current generation of astrophysical and cosmological neutrino search experiments (Auger, Icecube, and ANITA) and the next generation of Terraton detectors for neutrino measurements. …Read more.

CMB/LSS correlation as a probe of dark energy – Levon Pogosian Tue. February 15th, 2005
11:30 am-12:30 pm

Recent detection of the Integrated Sachs-Wolfe effect via cross-correlation of the CMB with large scale structure provided another piece of evidence for the existence of Dark Energy. Although cross-correlation measurements are limited by large statistical uncertainties, they probe physical processes that are only weakly constrained by the CMB spectra and the SNIa luminosity curves. …Read more.

Brane cosmology with an anisotropic bulk – Dani Steer Fri. February 11th, 2005
11:30 am-12:30 pm

In the context of brane cosmology, a scenario where our universe is a 3+1-dimensional surface (the “brane”) embedded in a five-dimensional spacetime (the “bulk”), we focus on geometries for which the brane is anisotropic though still homogeneous. …Read more.

The future of dark energy measurements – Dragan Huterer Tue. February 1st, 2005
11:30 am-12:30 pm

Evidence for the existence of some form of dark energy — a smooth component that causes the accelerated expansion of the universe and contributes about 70% of the total energy density — is by now very solid. …Read more.

Theoretical Constraints on the Dark Energy Equation of State – Mark Trodden Fri. January 28th, 2005
11:30 am-12:30 pm

Modern cosmological observations indicate that the expansion of the universe is accelerating. This is typically described in terms of the equation of state parameter of a hypothetical new component of the cosmic energy budget, presumed to be driving the acceleration. …Read more.

Observing the Cosmic Infrared Background with Frequency Selective Bolometers – Thushara Perera Tue. November 30th, 2004
11:30 am-12:30 pm

TBA …Read more.

Bayesian Analysis of the WMAP Data – Ben Wandelt Tue. November 16th, 2004
11:30 am-12:30 pm

The desire to solve the three cosmological conundra of dark matter, dark energy and initial conditions drives us to demand more from cosmological observations. We require methods that link observations to theory in a convenient and lossless way. …Read more.

Inflation, strings and the CMB – Ana Achucarro Tue. November 2nd, 2004
11:30 am-12:30 pm

In the last year there has been a sudden renewal of interest in cosmic (super)string networks. I will explain why and will discuss – in a non-technical way – some new cosmological models coming from superstring/supergravity theory, and how to constrain these models by their cosmic string production after inflation. …Read more.

Possible evidence for spatial fluctuations in dark energy – Christopher Gordon Tue. October 26th, 2004
11:30 am-12:30 pm

The WMAP cosmic microwave background (CMB) first year data was anomalously smooth on the largest spatial scales. We have recently shown that spatial fluctuations in the dark energy, that is causing the expansion of the Universe to speed up, may partially cancel the fluctuations in the CMB on the largest scales. …Read more.

Confronting Inflation with Observation – William Kinney Tue. October 19th, 2004
11:30 am-12:30 pm

Inflationary cosmology is a compelling model for the early universe, but until recently it has not been subject to precise experimental test. In the last year, new observations have made it possible not only to test the general predictions of inflation, but also to distinguish among (and rule out) particular models of inflation. …Read more.

Physics of the black hole-brane interaction – Dejan Stojkovic Tue. October 12th, 2004
11:30 am-12:30 pm

In models with extra dimensions that accommodate a TeV-scale gravity, small black holes that can be described by classical solutions of Einstein’s equations can exist. We study interaction of such black holes with our world — a brane embedded in a higher dimensional space. …Read more.

Racetrack Inflation – Jose Blanco-Pillado Sat. October 9th, 2004
11:30 am-12:30 pm

Four dimensional effective actions of many of the currently studied extra-dimensional theories seem to contain massless scalar fields called moduli. Giving these fields a potential is crucial to make these theories compatible with observations. …Read more.

First Results from the CAPMAP Experiment – Phil Farese Tue. September 28th, 2004
11:30 am-12:30 pm

CAPMAP is a dedicated 40 and 90 GHz CMB polarization experiment. Observing with a 7m radio telescope from Holmdale, NJ CAPMAP intends to measure the primary polarization of the CMB at small (60′-4′) angular scale where the signal is maximum. …Read more.

Affleck-Dine Leptogenesis Induced by the Flaton of Thermal Inflation – Wan-il Park Tue. September 14th, 2004
11:30 am-12:30 pm

We propose a simple model in which MSSM plus neutrino mass term, (LH_u)^2 is supplemented by a minimal flaton sector to drive the thermal inflation, and make two crucial assumptions: the flaton vacuum expectation value generates the mu-term of the MSSM and m_L^2 +m_{H_u}^2<0. …Read more.

Results from the Sudbury Neutrino Observatory Salt Phase and the Future of the SNO Detector – Darren Grant Tue. September 7th, 2004
11:30 am-12:30 pm

The Sudbury Neutrino Observatory is a heavy water Cherenkov detector designed to be sensitive to the total flux of Boron- 8 solar neutrinos. The addition of NaCl to the detector enhances the Neutral Current signal, and therefore improves the measurement of the total solar flux. …Read more.

BPS bounds of F- versus D-term strings and their cosmological implications – Filipe Freire Tue. August 24th, 2004
11:30 am-12:30 pm

Supersymmetry seems to facilitate the bringing together of inflationary models with particle physics. We give an overview of inflation models in supersymmetric theories. These models often lead to the production of cosmic strings after inflation. …Read more.

Solar Evidence for Neutrino Transition Magnetic Moments and Sterile Neutrinos – David Caldwell Fri. July 9th, 2004
1:30 pm-2:30 pm

While KamLAND apparently rules out Resonant-Spin-Flavor-Precession (RSFP) as an explanation of the solar neutrino deficit, the solar neutrino fluxes in the Cl and Ga experiments appear to vary with solar rotation. …Read more.

The Atacama Cosmology Telescope Project – Arthur Kosowsky Fri. June 11th, 2004
2:00 pm-3:00 pm

The Atacama Cosmology Telescope (ACT) is a custom-designed 6-meter microwave telescope employing superconducting bolometer array detectors, which will be located in the Atacama Desert of the Chilean Andes in 2006. It will provide maps of the cosmic microwave background at arcminute resolution and micro-Kelvin sensitivity over a hundred square degrees of sky. …Read more.

Terrestrial Mini-Bang: Transmuting a Color Glass Condensate into Quark Gluon Plasma at RHIC – Raju Venugopalan Tue. April 20th, 2004
11:30 am-12:30 pm

The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is currently completing run 5. We discuss some of the remarkable and unexpected results emerging from experiments on Gold-Gold collisions at the ultrarelativistic energies of RHIC as well as results from Deuteron-Gold and Proton-Proton collisions at the same energies. …Read more.

Octonions and Fermions – Corinne A. Manogue Wed. April 14th, 2004
2:30 pm-3:30 pm

Ten dimensional supersymmetric theories of physics such as superstring theory are at heart just higher dimensional generalizations of the Dirac equation. An enduring problem with these theories is how to reduce the spacetime dimension to the four we live in. …Read more.

Exoplanets, The Galactic Habitable Zone and the Age Distribution of Complex Life in the Milky Way – Charley Lineweaver Wed. April 7th, 2004
2:30 pm-3:30 pm

As we learn more about the Milky Way Galaxy, extrasolar planets and the evolution of life on Earth, qualitative discussions of the prerequisites for life in a Galactic context can become more quantitative. …Read more.

Cosmological magnetic fields vs. CMB – Tina Kahniashvili Tue. February 24th, 2004
11:30 am-12:30 pm

The cosmological perturbations induced by primordial magnetic fields and its influence on cosmic microwave background (CMB) radiation will be discussed. In particular, CMB temperature anisotropies, polarization, and temperature-polarization cross correlations, as well as Faraday rotation effect will be presented. …Read more.

Looking for Dark Energy with the SDSS and WMAP – Ryan Scranton Tue. February 10th, 2004
11:30 am-12:30 pm

We present measurements of the angular cross-correlation between luminous red galaxies from the Sloan Digital Sky Survey and the cosmic microwave background temperature maps from the Wilkinson Microwave Anisotropy Probe. Looking at a number of redshift slices and CMB bands, we find a statistically significant achromatic positive correlation between these data sets, consistent with the expected signal from the late Integrated Sachs-Wolfe effect. …Read more.

The Pierre Auger Observatory: A New Era Dawning in for Cosmic Rays – Corbin Covault Tue. February 3rd, 2004
11:30 am-12:30 pm

We are apparently at a unique moment in the history of cosmic ray physics. The origin of Ultra-High Energy Cosmic Rays (UCECR) has persisted as a profound astrophysical mystery for decades. …Read more.

Cosmological Observatiions of the QCD and Electroweak Early Universe Phase Transitions – Leonard Kisslinger Tue. January 27th, 2004
11:30 am-12:30 pm

Transitions
My coworkers and I have shown that if the QCD phase transition, at about T=150 MeV, is first order, the bubble nucleation and collisions would produce magnetic effects, which would give polarization correlations of the Cosmic Microwave Background Radiation distinct from those predicted by other theoretical cosmological studies. …Read more.


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