Past Events

High Energy Theory seminar: "Boundary conditions, zero modes, and spacetime entropy"
April 19, 2019  11:00 am  12:00 pm
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
April 15, 2019  2:00 pm  4:00 pm
David Rittenhouse Laboratory, 2N36
James Sully, University of British Columbia

Joint High Energy Experiment/Theory seminar
April 8, 2019  2:00 pm  4:00 pm
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"
April 3, 2019  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A8
Richie Bonventre, LBNL
The Mu2e experiment will measure the chargedlepton flavor violating (CLFV) neutrinoless 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"
March 25, 2019  2:00 pm  4:00 pm
David Rittenhouse Laboratory, 2N36
Vishnu Jejjala, University of the Witwatersrand
Nonextremal 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 socalled 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, nonextremal black holes generically have additional horizons.

High Energy Theory seminar: "Conformally Soft Photons and Gravitons"
March 18, 2019  2:00 pm  4:00 pm
David Rittenhouse Laboratory, 2N36
Laura Donnay, Harvard University
In this talk, the fourdimensional Smatrix 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
March 11, 2019  2:00 pm  4:00 pm
David Rittenhouse Laboratory, 2N36
Zack Lasner, Yale University

High Energy Theory seminar: "Direct Detection of subGeV Dark Matter: A New Frontier"
February 25, 2019  2:00 pm  4:00 pm
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 darkmatter candidates. Indeed, over the last decade, the theoretical landscape of possible darkmatter 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 darkma

High Energy Theory seminar
February 18, 2019  2:00 pm  4:00 pm
David Rittenhouse Laboratory, 2N36
Lara Anderson, Virgina Tech

High Energy Theory seminar: "Holographic Entropy Cone with Time Dependence"
February 4, 2019  2:00 pm  4:00 pm
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 bestknown examples are the strong subadditivity of entanglement entropy (SSA) and the monogamy of mutual information (MMI). Together, such inequalities define the socalled holographic entropy cone.