[Seminars] FW: [theory-seminar] REMINDER PARTICLE THEORY SEMINAR TODAY

[Ramona Echols]

REMINDER PARTICLE THEORY SEMINAR TODAY

DATE: Wednesday October 13th, 2021

TIME: 1:30 P.M.

LOCATION: MCP 201

SPEAKER: Matthew Lewandowski - Northern University
Title: "Gravitational Causality and the Self-Stress Photons"
Abstract:  We study causality in gravitational systems beyond the classical limit. Using on-shell methods, we consider the one-loop corrections from charged particles to the photon energy-momentum tensor - the self-stress - that controls the quantum interaction between two on-shell photons and one off-shell graviton. The self-stress determines in turn the phase shift and time delay in the scattering of photons against a spectator particle of any spin in the eikonal regime. We show that the sign of the β-function associated to the running gauge coupling is related to the sign of time delay at small impact parameter. Our results show that, at first post-Minkowskian order, asymptotic causality, where the time delay experienced by any particle must be positive, is respected quantum mechanically. Contrasted with asymptotic causality, we explore a local notion of causality, where the time delay is longer than the one of gravitons, which is seemingly violated by quantum effects.

Upcoming In Person and Zoom Talks:
Kadanoff Seminar: Geoff Pennington, IAS/Berkeley, Seminar Date, October 18th, 1:30PM, Title: "Quantum minimal surfaces from quantum error correction"
Particle Theory Seminar: Sergei Dubovsky, New York University, Seminar Date, October 20th, 1:30PM, Title: "TBA"
Kadanoff Seminar: (VIA ZOOM) Liujun Zou, Perimeter Institute, Seminar Date, October 25th, 1:30PM, Title: "Stiefel liquids: possible non-Lagrangian quantum criticality from intertwined orders."
Particle Theory Seminar: (VIA ZOOM) Juan Criado, Durham University, Seminar Date, October 27th, 1:30PM, Title: "Electroweak skyrmions in the HEFT."
Kadanoff Seminar: (VIA ZOOM) Luckasz Fidkowski, University of Washington, Seminar Date, November 1st, Title: "Stiefel liquids: possible non-Largtangian quantum criticality from intertwined orders."
Kadanoff Seminar: Yifan Wang, New York University, Seminar Date, November 8th, 1:30PM, Title: "TBA"
Particle Theory Seminar: James Halverson, Northwestern, Seminar Date, November 10th, 1:30PM, Title: "TBA"
Kadanoff Seminar: (VIA ZOOM) Shota Komatsu, CERN, Seminar Date, November 15th, 1:30PM, Title: "TBA"
Particle Theory Seminar: Djodje Radicevic, Brandeis University, Seminar Date, November 17th, 1:30PM, Title: " An Introduction to The Lattice-Continuum Correspondence"
Kadanoff Seminar: Daniel Jafferid , Harvard University, Seminar Date, November 22nd, 1:30PM, Title: "TBA"
Kadanoff Seminar: Victor Gorenko, Stanford University, Seminar Date, December 6th, Title: "TBA"
Particle Theory Seminar: (VIA ZOOM) Keith Dienes, Arizona University, Seminar Date, December 8th, Title: "TBA"
Particle Theory Seminar: Alessandro  Sfondrini, IAS, Seminar Date, January  12th, Title: "TBA"

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