**To connect to the HET Seminar via Zoom, please do the following:**

1 - If you have Zoom installed on your device, enter the following meeting ID: 730333408, click Join Meeting.

2 - If you do not have Zoom installed, click the following link to download and install: https://theias.zoom.us/j/730333408

3 - Once installed, click the very same link to connect to the meeting.**Abstract:** The appearance of BMS symmetry as the asymptotic symmetry of Minkowski spacetime suggests a holographic relation between Einstein gravity and quantum field theory with BMS invariance, dubbed BMSFT. With a three dimensional bulk, the dual BMSFT is a non-Lorentz invariant, two dimensional field theory with infinite-dimensional symmetries. In this talk, I will argue that entanglement entropy in BMSFT can be described by a swing surface in the bulk. For a single interval at null infinity, the corresponding swing surface consists of two ropes which are null geodesics emanating from the entangling surface at the boundary, and a bench, which is a spacelike geodesic extremizing the distance between the ropes.

# HET Seminar | Wei Song, Member, School of Natural Sciences, Institute for Advanced Study, Tsinghua University | "Entanglement Entropy in Flat Holography" | via Zoom

Fri, May 15, 2020, 1:45 pm

Location:

via Zoom

Speaker(s):

Wei Song

Member, School of Natural Sciences, Institute for Advanced Study; Tsinghua University

“Entanglement Entropy in Flat Holography”