Past Events

  • High Energy Theory seminar: "Boundary conditions, zero modes, and spacetime entropy"

    David Rittenhouse Laboratory, 2C8

    James Sully, University of British Columbia

    How do we describe the local Hilbert space of a continuum field theory? And does this have lessons to teach us about the emergence of spacetime in AdS/CFT? I will describe how to define the Hilbert space of an interval in a 2D CFT without turning to abstruse mathematics. For CFTs with a gravitational dual, this leads to a theory of gravitational membranes and new insights for understanding spacetime entropy.

  • High Energy Theory seminar

    David Rittenhouse Laboratory, 2N36

    James Sully, University of British Columbia

  • Joint High Energy Experiment/Theory seminar

    David Rittenhouse Laboratory, 2N36

    Tracy Slatyer, Massachusetts Institute of Technology

  • Experimental Particle Physics Seminar: "Searching for muon to electron conversion: The Mu2e experiment at Fermilab"

    David Rittenhouse Laboratory, A8

    Richie Bonventre, LBNL

    The Mu2e experiment will measure the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. Mu2e will improve the previous measurement by four orders of magnitude, reaching a 90% C.L. sensitivity to CLFV conversion rates of 8x10^-17 or larger. The experiment will reach mass scales of nearly 10^4 TeV, far beyond the direct reach of colliders. It will be sensitive to a wide range of new physics, complementing and extending other CLFV searches.

  • High Energy Theory seminar: "General hot attractors"

    David Rittenhouse Laboratory, 2N36

    Vishnu Jejjala, University of the Witwatersrand

    Non-extremal black holes such as the astrophysical black holes we encounter in the sky remain mysterious objects. As solutions to general relativity, they possess certain invariants. We extend prior investigations of so-called hot attractor black holes to higher dimensions and add a scalar potential. In addition to the event and Cauchy horizons, when we complexify the radial coordinate, non-extremal black holes generically have additional horizons.

  • High Energy Theory seminar: "Conformally Soft Photons and Gravitons"

    David Rittenhouse Laboratory, 2N36

    Laura Donnay, Harvard University

    In this talk, the four-dimensional S-matrix is reconsidered as a correlator on the celestial sphere at null infinity. Asymptotic particle states can be characterized by the point at which they enter or exit the celestial sphere as well as their SL(2,C) Lorentz quantum numbers: namely their conformal scaling dimension and spin instead of the energy and momentum. This characterization precludes the notion of a soft particle whose energy is taken to zero. I will propose it should be replaced by the notion of a "conformally soft" particle with h=0 or \bar h=0.

  • Joint High Energy Experiment/Theory seminar

    David Rittenhouse Laboratory, 2N36

    Zack Lasner, Yale University

  • High Energy Theory seminar: "Direct Detection of sub-GeV Dark Matter: A New Frontier"

    David Rittenhouse Laboratory, A8

    Rouven Essig, Stony Brook University

    Dark matter makes up 85% of the matter in our Universe, but we have yet to learn its identity.  While most experimental searches focus on Weakly Interacting Massive Particles (WIMPs) with masses above the proton (about 1 GeV/c^2), it is important to also consider other motivated dark-matter candidates.  Indeed, over the last decade, the theoretical landscape of possible dark-matter candidates has expanded significantly to consider masses from 10^-22 eV/c^2 up to the Planck mass, and even higher in the case of composite dark matter.  At the same time, many novel dark-ma

  • High Energy Theory seminar

    David Rittenhouse Laboratory, 2N36

    Lara Anderson, Virgina Tech

  • High Energy Theory seminar: "Holographic Entropy Cone with Time Dependence"

    David Rittenhouse Laboratory, 2N36

    Bartek Czech, Tsinghua University

    In the AdS/CFT correspondence, if a CFT state is dual to a semiclassical spacetime, its entanglement entropies (minimal surface areas) must obey certain inequalities. The best-known examples are the strong subadditivity of entanglement entropy (SSA) and the monogamy of mutual information (MMI). Together, such inequalities define the so-called holographic entropy cone.