From i ° to the 3+1 description of spatial infinity
From i ° to the 3+1 description of spatial infinity
复制标题
从i°到空间无限的3+1描述
DOI：
10.1063/1.526500
复制
发表时间：
1984
影响因子：
1.3
通讯作者：
A. Magnon
中科院分区：
文献类型：
--
作者：
A. Ashtekar;A. Magnon
通过对spi框架进行3+1分解，在i°处用Weyl曲率定义的守恒量的表达式，根据物理时空的初始数据进行了重制。特别地，分析提出了通常的3+1角动量定义中的超平移歧义，并澄清了在3+1框架内消除这些歧义所需的更强边界条件的含义。讨论是这样安排的，只需对spi框架有最低限度的了解就可以理解这些问题。
By carrying out a 3+1 decomposition of the spi framework, the expressions of the conserved quantities, defined at i ° in terms of the Weyl curvature, are recast in terms of the initial data of the physical space‐time. In particular, the analysis brings out the supertranslation ambiguities in the usual 3+1 definitions of angular momentum and clarifies, within the 3+1 framework, the meaning of the stronger boundary condition needed to remove these ambiguities. The discussion is so arranged that only a minimal acquaintance with the spi framework is necessary to appreciate these issues.