论文标题
及时无限的广义BMS代数
Generalized BMS Algebra at Timelike Infinity
论文作者
论文摘要
在零无穷大的文献中，BMS组（以及各种概括）已被广泛研究为渐近平坦的对称组。软定理与BMS对称性之间的复杂关系也激发了对时间样无穷大的这种渐近对称性的定义。尽管在文献中定义了在时间样无穷大的情况下生成（广义）BMS代数的矢量场，但尚未研究代数。在本文中，我们填补了这个空白。我们表明，在Barnich等人提出的修改后的谎言括号内，产生球体差异的超级翻译和矢量场。
BMS group (and it's various generalizations) at null infinity have been studied extensively in the literature as the symmetry group of asymptotically flat spacetimes. The intricate relationship between soft theorems and the BMS symmetries have also motivated the definition of such asymptotic symmetries to time-like infinity. Although the vector fields that generate the (generalized) BMS algebra at time-like infinity was defined in the literature, the algebra has not been investigated. In this paper, we fill this gap. We show that the super-translations and vector fields that generate sphere diffeomorphisms close under the modified Lie bracket proposed by Barnich et al.
