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arXiv 2102.03235gr-qcmath-phmath.DGmath.MP
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angular momentum的超平移不变性

Supertranslation invariance of angular momentum

Po-Ning Chen, Mu-Tao Wang, Ye-Kai Wang, Shing-Tung Yau

摘要:

LIGO对引力波的成功探测,使人们对引力辐射带走的角动量的理论认识重新焕发了活力。无限维超翻译歧义是近几十年来研究的一个基本难题。最近取得的进展,以解决和量化的超翻译歧义的背景下,紧凑的二进制聚结。在这里,我们提出的第一个定义角动量在广义相对论是完全免费的超平移歧义。新的定义是从作者以前定义的准定域角动量的极限导出的。提出了一种新的零无穷远质心定义,并证明了该定义具有超平移不变性。与经典的Bondi-Sachs能量动量一起,它们形成了一套完整的零无穷大守恒量,根据基本物理定律进行变换。

英文摘要:

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 decades of study. Recent advances were made to address and quantify the supertranslation ambiguity in the context of compact binary coalescence. Here we present the first definition of angular momentum in general relativity that is completely free from supertranslation ambiguity. The new definition was derived from the limit of the quasilocal angular momentum defined previously by the authors. A new definition of center of mass at null infinity is also proposed and shown to be supertranslation invariant. Together with the classical Bondi-Sachs energy-momentum, they form a complete set of conserved quantities at null infinity that transform according to basic physical laws.

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