arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.0506gr-qc
收藏

球对称时空的准局域能量

Quasi-local Energy for Spherically Symmetric Spacetimes

Ming-Fan Wu, Chiang-Mei Chen, Jian-Liang Liu, James M. Nester

摘要:

我们提出了两种互补的方法来确定参考的协变哈密顿边界项准局部能量和测试球对称时空。一方面,我们等距匹配的2-曲面和极值的能量。这可以通过两种方式来实现,我们称之为程序I(无约束)和程序II(有附加约束)。另一方面,我们匹配的正交4-框架的动态和参考时空。然后,如果我们通过要求参考位移是参考的类时基灵向量来进一步指定观察者,结果与程序I相同,能量可以是正的,零的,甚至是负的。相反,如果我们要求在动态时空和参考时空中沿着位移向量的二面积的李导数相同,则结果与程序II相同,并且满足通常的准则:能量是非负的,并且仅在闵可夫斯基(或反德西特)时空中为零。

英文摘要:

We present two complementary approaches for determining the reference for the covariant Hamiltonian boundary term quasi-local energy and test them on spherically symmetric spacetimes. On the one hand, we isometrically match the 2-surface and extremize the energy. This can be done in two ways, which we call programs I (without constraint) and II (with additional constraints). On the other hand, we match the orthonormal 4-frames of the dynamic and the reference spacetimes. Then, if we further specify the observer by requiring the reference displacement to be the timelike Killing vector of the reference, the result is the same as program I, and the energy can be positive, zero, or even negative. If, instead, we require that the Lie derivatives of the two-area along the displacement vector in both the dynamic and reference spacetimes to be the same, the result is the same as program II, and it satisfies the usual criteria: the energies are non-negative and vanish only for Minkowski (or anti-de Sitter) spacetime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑