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Event Date Summary
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.


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