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Total mass and limits of quasi-local mass at future null infinity | | Mu-Tao Wang
; | | Date: |
17 Mar 2020 | | Abstract: | An idealized observer of an astronomical event is situated at future null
infinity, where light rays emitted from the source approach. Mathematically,
null infinity corresponds to the portion of the spacetime boundary defined by
equivalence classes of null geodesics. But what can we observe at future null
infinity? In the note, we start by reviewing the description of null infinity
in terms of the Bondi-Sachs coordinate system. In particular, we reformulate
and extend the invariance of Bondi mass and the mass loss formula in terms of a
modified mass aspect 2-form. At the end, we discuss new results about the limit
of quasilocal mass of unit spheres at null infinity in a Bondi-Sachs coordinate
system. This is based on joint work with Po-Ning Chen, Jordan Keller, Ye-Kai
Wang, and Shing-Tung Yau. | | Source: | arXiv, 2003.7732 | | Services: | Forum | Review | PDF | Favorites | |
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