Past Events

High Energy Theory Seminar: "Entanglement in gauge theories and gravity"
September 24, 2018  2:00 pm  3:00 pm
David Rittenhouse Laboratory, 2N36
Jennifer Lin, IAS, Princeton University
In this talk I'll explain why an analogy between entanglement entropy in an emergent gauge theory and in AdS/CFT suggests that the entropy of a black hole may be related to a natural measure on the gauge group in the bulk. I will then provide an explicit example of this in JackiwTeitelboim gravity.

High Energy Theory Seminar: "Complementarity from Identity"
September 17, 2018  2:00 pm  3:00 pm
David Rittenhouse Laboratory, 2N36
Sergei Dubovsky, New York University

Department Colloquium: “A New Era of Science at Jefferson Lab”
September 12, 2018  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A8
Robert McKeown, Deputy Director for Science, JLAB
The continuous electron beam accelerator facility at Jefferson Lab, built with advanced superconducting radiofrequency (SRF) technology, provides opportunities to discover fundamental new aspects of the structure of visible matter – protons, neutrons and other states, and of the strong interaction, described by the gauge theory Quantum Chromodynamics. The recent upgrade of the facility brings new opportunities, not only in the study of hadronic matter, but also in searches for new physics, such as a suite of experiments to search for massive “dark photons”. This presentation 
High Energy Theory Seminar: "Analytic IRresummation for the BAO peak"
September 10, 2018  2:00 pm  3:00 pm
David Rittenhouse Laboratory, 2N36
Matthew Lewandowsky, Institut de Physique Théorique (IPhT)
We develop an analytic method for implementing the IRresummation of 1404.5954, which allows one to correctly and consistently describe the imprint of baryon acoustic oscillations (BAO) on statistical observables in largescale structure. We show that the final IRresummed correlation function can be computed analytically without relying on numerical integration, thus allowing for an efficient and accurate use of these predictions on real data in cosmological parameter fitting.

High Energy Theory Seminar: "Interfaces and Topological Entanglement in Abelian ChernSimons Theory"
September 6, 2018  2:00 pm  3:00 pm
David Rittenhouse Laboratory, 4N12
Jackson Fliss, University of Illinois, Urbana Champaign
Starting from the condensed matter context, we consider the ground state entanglement across (possibly distinct) topological phases separated by a gapped interface. I will explain how addressing this from the effective gauge theory illuminates some generic features of entanglement entropy in systems with gauge invariance. In particular, we will explicitly implement the "extended Hilbert space" prescription directly in the continuum as well as highlight the unique role of the Ishibashi state in ChernSimons entanglement. Time permitting, I will discuss exten

Condensed Matter Seminar: "Soft Matter Physics of the Evolution of MultiCellularity"
September 5, 2018  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A6
Peter Yunker, Georgia Institute of Technology
The evolution of multicellularity set the stage for an incredible increase in the diversity and complexity of life on Earth. The increase in biological complexity associated with multicellularity required parallel innovation in the mechanical properties of multicellular bodies. Though a cursory review of any multicellular organism provides an appreciation of this intertwining of biological and mechanical complexity, little is known about how such mechanical properties may have evolved.

Astronomy seminar: "Cosmological Seed Magnetic Field from Inflation"
September 5, 2018  2:00 pm  3:00 pm
David Rittenhouse Laboratory, A6
Bharat Ratra, Kansas State University
A cosmological magnetic field of nG strength on Mpc length scales could be the seed magnetic field needed to explain observed few microG largescale 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 noninflationary 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.

Dissertation Defense: "Characterizing the Energy Landscape in Solution Processable Materials via FrequencyDependent Impedance Measurements."
September 4, 2018  10:00 am
Eric Wong
Singh 221

Physics and Astronomy Postponed Exam
August 29, 2018  6:00 pm  8:00 pm
DRL A1

Condensed Matter Seminar: "Physics and Applications of Mesoscopic Optics"
August 29, 2018  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A6
Hui Cao, Yale University
Random scattering of light, e.g., in paint, clouds, and biological tissue, is a common process of both fundamental interest and practical relevance. The interference of multiply scattered waves also leads to remarkable phenomena in mesoscopic physics such as Anderson localization and universal conductance fluctuations. In applications, optical scattering is the main obstacle to imaging or sending information through turbid media.