Joint Harvard-CUHK-YMSC Differential Geometry Seminar
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