Event | Date | Summary |
Bira van Kolck (Institut de Physique Nucleaire d’Orsay and University of Arizona) | Tue. December 10th, 2019 11:30 am-12:30 pm |
A New Leading Mechanism for Neutrinoless Double-Beta Decay … or how to attract the ire of the community. The neutrinoless double-beta decay of nuclei is essentially the only way to test lepton-number violation coming from the possible Majorana character of neutrinos. Tremendous effort is dedicated to its measurement and to reducing the theoretical uncertainty in the calculation of the nuclear matrix elements needed for its interpretation. Well, we increase the uncertainty. Continue reading… Bira van Kolck (Institut de Physique Nucleaire d’Orsay and University of Arizona) |
Roman Scoccimarro (NYU) | Tue. November 26th, 2019 11:30 am-12:30 pm |
Bispectrum Bias Loops and Power Spectrum Covariance I will discuss recent progress in two topics in large-scale structure: 1) understanding galaxy bias beyond leading order in perturbation theory and its application to the bispectrum, and 2) how to model the covariance of the galaxy power spectrum multipoles analytically instead of using numerical simulations. |
Garrett Goon (CMU) | Tue. November 19th, 2019 11:30 am-12:30 pm |
Linking Corrections to Entropy and Extremality I will prove that the leading perturbative corrections to the entropy and extremality bounds of black holes are directly proportional to each other, generically. This fact is intimately related to the Weak Gravity Conjecture, as I will discuss. The proof is purely thermodynamic and applies to systems beyond the gravitational realm. |
Jesse Thaler (MIT) | Fri. November 15th, 2019 12:45 pm-1:45 pm |
Quantum Algorithms for Collider Physics As particle physics experiments continue to stretch the limits of classical computation, it is natural to ask about the potential future role of quantum computers. In this talk, I discuss the potential relevance of quantum algorithms for collider physics. I present a proof-of-concept study for “thrust”, a well-known collider observable that has O(N^3) runtime for a collision involving N final-state particles. Thrust is a particularly interesting observable in this context, since it has two dual formulations, one which naturally maps to quantum annealing and one which naturally maps to Grover search. |
Clara Murgui (IFIC, Valencia) | Tue. November 5th, 2019 11:30 am-12:30 pm |
The QCD Axion and Unification The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range ma ≃ (3 − 13) × 10−9 eV. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window. |
Juri Smirnov (Ohio State University) | Tue. October 29th, 2019 11:30 am-12:30 pm |
Dark Matter Research with Bound Systems |
Chi Tian (CWRU) | Tue. October 15th, 2019 11:30 am-12:30 pm |
Black-Hole Lattices as Cosmological Models Challenges for modern cosmology include determining the influence the small-scale structure has in the universe on its large-scale dynamics and observations. With numerical relativity tools, finding and exploring cosmological models which are exact solutions to the Einstein equations will resolve all the non-linearities so that give us hints on quantifying the influence. In this talk, I will introduce Black-Hole Lattice models, which are subsets of relativistic discrete cosmological models. In particular, I will start from constructing those spacetimes and show what we can learn from exploring their properties. |
Cedric Weiland (University of Pittsburgh) | Tue. October 8th, 2019 11:30 am-12:30 pm |
Electroweak measurements at electron-positron colliders as indirect searches for heavy neutrinos Heavy neutrinos are part of many extensions of the Standard Model, in particular seesaw models that can explain the light neutrino masses and mixing. Future electron-positron colliders would greatly increase the precision of the measurements of electroweak processes. I will discuss how this improved precision offers new opportunities to search for the effects of heavy neutrinos. In particular, I will focus on indirect search strategies based on the modifications of the production cross-sections of W or Higgs bosons at linear collider. These searches are complementary to other observables and would allow to probe the multi-TeV mass regime at future colliders. |
Gilles Gerbier (Queen’s U) | Tue. October 1st, 2019 11:30 am-12:30 pm |
Searching for low mass dark matter particles at SNOLAB 90 years after its first evidence by F Zwicky, the nature of the dark matter of the Universe is still unknown. There is a consensus it should be made of elementary particles but their search has been going on for several decades without success. Huge progress in sensitivity has been done, though, thanks to new innovative detection techniques. Indeed some new techniques allow to enlarge the exploration of parameter space. I will describe status of two projects I have developed, within international collaborations, thanks to a CERC grant in Canada, |
Laura Johnson (CWRU) | Tue. September 24th, 2019 11:30 am-12:30 pm |
Massive Gravitons in Curved Spacetimes This talk will cover various interesting topics that occur in massive spin-2 on various spacetimes |
Goran Senjanovic (ICTP, Trieste) | Fri. September 20th, 2019 12:45 pm-1:45 pm |
The fall and rise of parity and the origin of (neutrino) mass |
Goran Senjanovic (ICTP, Trieste) | Wed. September 18th, 2019 1:30 pm-2:30 pm |
Strong CP violation: fancy and fact |
Callum Jones (University of Michigan) | Tue. September 10th, 2019 11:30 am-12:30 pm |
Born-Infeld Electrodynamics at One-Loop The Born-Infeld model is an effective field theory of central importance describing the low-energy dynamics of massless gauge bosons on the world-volume of D-branes. Though it is in many ways exceptional in the universality class of models of nonlinear electrodynamics, several aspects of the physics of the Born-Infeld model remain mysterious. In this talk I will explain how aspects of the model, obscured in the traditional formulation of Lagrangian field theory, are clarified by directly studying the on-shell S-matrix. In particular in 3+1-dimensions, classical Born-Infeld has an electromagnetic duality symmetry which manifests in tree-level scattering amplitudes as the conservation of a chiral charge. |
Erin Blauvelt (Lehigh University) | Mon. September 9th, 2019 3:15 pm-4:15 pm |
Striped and Superconducting Phases in Holography There is a duality out of the framework of string theory that tells us, in certain cases, gravity can be thought of as emerging from the quantum mechanical degrees of freedom of a system. Remarkably, this relationship has not only given us a long sought after microscopic description of black holes and insights into the fabric of spacetime, but has also proven itself useful as a novel analytic toolset to investigate non-perturbative systems. Known as holography, this weak/strong coupling duality allows us to examine strongly coupled quantum systems by mapping them to perturbative, |
Bharat Ratra (Kansas State University) | Fri. September 6th, 2019 11:30 am-12:30 pm |
Cosmological Seed Magnetic Field from Inflation A cosmological magnetic field of nG strength on Mpc length scales could be the seed magnetic field needed to explain observed few microG large-scale galactic magnetic fields. I first briefly review the observational and theoretical motivations for such a seed field, two galactic magnetic field amplification models, and some non-inflationary seed field generation scenarios. I then discuss an inflation magnetic field generation model. I conclude by mentioning possible extensions of this model as well as potentially observable consequences. |