Supertranslation invariance of angular momentum
時 間 Time:2023-05-11 12:00-13:30 (星期四 Thur.)
地 點 Place:S101
![](https://cantor.math.ntnu.edu.tw/wp-content/uploads/2023/04/145_1.jpg)
王業凱 教授 (Professor Ye-Kai Wang)
國立陽明交通大學應用數學系 (Math, NYCU)
LIGO’s successful detection of gravitational waves has revitalized the theoretical understanding of the angular momentum carried away by gravitational radiation. An infinite-dimensional “supertranslation ambiguity” has presented an essential difficulty for studying angular momentum at null infinity. In this talk, we will present a definition of angular momentum in general relativity that is supertranslation invariant. The new definition of angular momentum is derived from the limit of the Chen-Wang-Yau quasilocal angular momentum. The talk is based on joint work with Po-Ning Chen, Jordan Keller, Mu-Tao Wang and Shing-Tung Yau.
![](https://cantor.math.ntnu.edu.tw/wp-content/uploads/2020/08/演講標尾.jpg)