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arXiv 2402.18993gr-qc
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轴对称时空中的类Kodama矢量场

Kodama-like Vector Fields in Axisymmetric Spacetimes

Philipp Dorau, Rainer Verch

AI总结:

本研究将动态球对称时空的Kodama对称性推广到Kerr-Vaidya、Kerr-Vaidya-de Sitter等动态轴对称时空,证明这类时空中存在类Kodama类时矢量场,可构造协变守恒流与局域守恒荷,且后者在渐近平坦区收敛于Brown-York质量。

摘要:

我们将Kodama对称性(动态球对称时空中的一种准局域时间平移对称性)的概念推广到一类特定的动态轴对称时空,即Kerr-Vaidya和Kerr-Vaidya-de Sitter时空族。我们研究了渐近平坦Kerr-Vaidya度规的一些几何性质,如Brown-York质量和爱因斯坦张量。此外,我们提出将Kerr-Vaidya度规推广到渐近de Sitter背景的方案。我们证明,对于这几类动态轴对称黑洞时空,存在一个类时矢量场,其表现出与球对称情形下Kodama矢量场相似的性质。这包括构造协变守恒流及对应的局域守恒荷,在Kerr-Vaidya情形下,该守恒荷在渐近平坦区域收敛于Brown-York质量。

英文摘要:

We extend the concept of the Kodama symmetry, a quasi-local time translation symmetry for dynamical spherically symmetric spacetimes, to a specific class of dynamical axisymmetric spacetimes, namely the families of Kerr-Vaidya and Kerr-Vaidya-de Sitter spacetimes. We study some geometrical properties of the asymptotically flat Kerr-Vaidya metric, such as the Brown-York mass and the Einstein tensor. Furthermore, we propose a generalization of the Kerr-Vaidya metric to an asymptotic de Sitter background. We show that for these classes of dynamical axisymmetric black hole spacetimes, there exists a timelike vector field that exhibits similar properties to the Kodama vector field in spherical symmetry. This includes the construction of a covariantly conserved current and a corresponding locally conserved charge, which in the Kerr-Vaidya case converges to the Brown-York mass in the asymptotically flat region.

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