Past Events

  • High Energy Theory Seminar: "Complementarity from Identity"

    David Rittenhouse Laboratory, 2N36

    Sergei Dubovsky, New York University

  • Department Colloquium: “A New Era of Science at Jefferson Lab”

    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 IR-resummation for the BAO peak"

    David Rittenhouse Laboratory, 2N36

    Matthew Lewandowsky, Institut de Physique Théorique (IPhT)

    We develop an analytic method for implementing the IR-resummation of 1404.5954, which allows one to correctly and consistently describe the imprint of baryon acoustic oscillations (BAO) on statistical observables in large-scale structure. We show that the final IR-resummed 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 Chern-Simons Theory"

    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 Chern-Simons entanglement.  Time permitting, I will discuss exten

  • Condensed Matter Seminar: "Soft Matter Physics of the Evolution of Multi-Cellularity"

    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 multi-cellularity required parallel innovation in the mechanical properties of multi-cellular bodies. Though a cursory review of any multi-cellular 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"

    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 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.

  • Dissertation Defense: "Characterizing the Energy Landscape in Solution Processable Materials via Frequency-Dependent Impedance Measurements."

    Eric Wong

    Singh 221

  • Physics and Astronomy Postponed Exam

    DRL A1

  • Condensed Matter Seminar: "Physics and Applications of Mesoscopic Optics"

    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.

  • Experimental Particle Physics Seminar: "Exploring the landscape of electroweak supersymmetry at the LHC: a quest for a better understanding of dark matter"

    David Rittenhouse Laboratory, 3W2

    Sarah Williams, University of Cambridge