Joint Harvard-CUHK-YMSC Differential Geometry Seminar

DIFFERENTIAL GEOMETRY

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October 6, 2021 9:30 pm - 10:30 pm

via Zoom Video Conferencing

Speaker:

Professor Mutao Wang - Columbia University

will speak on:

"Angular momentum in general relativity"

Tuesday, October 5, 2021

9:30 - 10:30 AM *Hong Kong time*

9:30 - 10:30 PM *Eastern Time*

Abstract: The definition of angular momentum in general relativity has been a subtle issue since the 1960', due to the discovery of “supertranslation ambiguity”: the angular momentums recorded by two distant observers of the same system may not be the same. In this talk, I shall show how the mathematical theory of optimal isometric embedding and quasilocal angular momentum identifies a correction term, and leads to a new definition of angular momentum that is free of any supertranslation ambiguity. This is based on joint work with Po-Ning Chen, Jordan Keller, Ye-Kai Wang, and Shing-Tung Yau.

Zoom Link: https://cuhk.zoom.us/j/93114537124
Meeting ID: 931 1453 7124, Passcode: 20211006