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arXiv 1803.03054gr-qc
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多个杀戮视界

Multiple Killing Horizons

Marc Mars, Tim-Torben Paetz, José M. M. Senovilla

摘要:

Killing视界可以是这样的两个或多个线性无关的Killing向量进行了研究。我们提供了一个严格的定义,然后证明了一组Killing向量共享一个Killing视界是一个李代数$\mathcal{A}_{\mathcal{H}}$的维度最多的维的时空。我们证明,不能附加不同的表面重力,这样多个Killing视界,因为它们有一个基本上唯一的非零表面重力(或没有)。$\mathcal{A}_{\mathcal{H}}$总是包含一个阿贝尔(子)-代数-其元素都有消失的表面重力-其维数等于或小于dim $\mathcal{A}_{\mathcal{H}}$。只有两种不等价的可能性,取决于是否存在非零的表面引力。我们显示了与近地平线几何的连接,并提出了一个线性系统的偏微分方程,主方程,在地平线上的两个Killing向量的多个Killing地平线之间的比例函数,其可积性条件。我们提供了明确的例子,所有可能类型的多个Killing视界,以及它们在最大对称时空中的完整分类。

英文摘要:

Killing horizons which can be such for two or more linearly independent Killing vectors are studied. We provide a rigorous definition and then show that the set of Killing vectors sharing a Killing horizon is a Lie algebra $\mathcal{A}_{\mathcal{H}}$ of dimension at most the dimension of the spacetime. We prove that one cannot attach different surface gravities to such multiple Killing horizons, as they have an essentially unique non-zero surface gravity (or none). $\mathcal{A}_{\mathcal{H}}$ always contains an Abelian (sub)-algebra ---whose elements all have vanishing surface gravity--- of dimension equal to or one less than dim $\mathcal{A}_{\mathcal{H}}$. There arise only two inequivalent possibilities, depending on whether or not there exists the non-zero surface gravity. We show the connection with Near Horizon geometries, and also present a linear system of PDEs, the master equation, for the proportionality function on the horizon between two Killing vectors of a multiple Killing horizon, with its integrability conditions. We provide explicit examples of all possible types of multiple Killing horizons, as well as a full classification of them in maximally symmetric spacetimes.

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