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arXiv 1807.02679gr-qc
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多重杀伤视界和近视界几何

Multiple Killing Horizons and Near Horizon Geometries

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

摘要:

考虑了具有多重退化Killing视界$\mathcal{H}$的近视界几何,并确定了它们的退化Killing向量场.我们证明了它们都源于$\mathcal{H}$的任何具有继承度量的切割的超曲面正交Killing向量--切割是包含在$\mathcal{H}$中的类空余维两个子流形。对于给定切割上的这些Killing向量中的每一个,近地平线度量有三种不同的可能性,它们被明确地提出。的结构的度量近地平线几何与多个Killing地平线的顺序$m\geq 3$,从而完全确定,特别是我们证明了$\mathcal{H}$上的削减必须是翘曲的产品与最大对称纤维(ergo的常曲率)。多个简并Killing视界是否可能通过使用不同的简并Killing导致不等价的近视界几何的问题得到了解决,并回答了否定的:从给定的多个简并Killing视界(使用不同的简并Killing)构建的所有近视界几何都是等距的。

英文摘要:

Near Horizon Geometries with multiply degenerate Killing horizons $\mathcal{H}$ are considered, and their degenerate Killing vector fields identified. We prove that they all arise from hypersurface-orthogonal Killing vectors of any cut of $\mathcal{H}$ with the inherited metric -- cuts are spacelike co-dimension two submanifolds contained in $\mathcal{H}$. For each of these Killing vectors on a given cut, there are three different possibilities for the Near Horizon metric which are presented explicitly. The structure of the metric for Near Horizon Geometries with multiple Killing horizons of order $m\geq 3$ is thereby completely determined, and in particular we prove that the cuts on $\mathcal{H}$ must be warped products with maximally symmetric fibers (ergo of constant curvature). The question whether multiple degenerate Killing horizons may lead to inequivalent Near Horizon Geometries by using different degenerate Killings is addressed, and answered on the negative: all Near Horizon geometries built from a given multiple degenerate Killing horizon (using different degenerate Killings) are isometric.

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