论文标题
广义BMS电荷代数
Generalized BMS charge algebra
论文作者
论文摘要
有人认为，零无穷大的重力对称性应包括差异$（s^2）$因子与天体球体上的差异性相关的因子。但是，重力的标准相空间不支持这种转换的作用。在Laddha和其中一位作者的早期作品的基础上，我们提出了Null Infinity的重力阶段空间的扩展，该重力在其上差异$（S^2）$在规范上起作用。超级倾斜和差异$（s^2）$（s^2）的泊松支架重现了Arxiv中引入的广义BMS代数：1408.2228。
It has been argued that the symmetries of gravity at null infinity should include a Diff$(S^2)$ factor associated to diffeomorphisms on the celestial sphere. However, the standard phase space of gravity does not support the action of such transformations. Building on earlier work by Laddha and one of the authors, we present an extension of the phase space of gravity at null infinity on which Diff$(S^2)$ acts canonically. The Poisson brackets of supertranslation and Diff$(S^2)$ charges reproduce the generalized BMS algebra introduced in arXiv:1408.2228 .
