arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.09152hep-thastro-ph.HEgr-qchep-ph
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从多极比看黑洞

Black Holes Lessons from Multipole Ratios

Iosif Bena, Daniel R. Mayerson

摘要:

详细说明了如何计算最一般的具有四个磁荷和四个电荷的四维非极值黑洞的引力质量和角动量多极子。我们还计算了这些多极一般超对称四维微观几何形状和多中心的解决方案。对于克尔黑洞和BPS黑洞,许多多极子消失了。然而,如果我们把这些黑洞嵌入弦论,并使它们稍微变形,我们就可以计算出无穷多个消失多极子的比率,当变形消失时,这些比率仍然是有限的,并且它们的值与变形的方向无关。对于超对称黑洞,我们也可以通过取多中心解的标度极限来计算这些比值,并且对于某些黑洞,使用这两种方法计算的比值是一致的。对于克尔黑洞,这些比率对可能偏离克尔几何的参数化构成了强有力的约束,这些参数化应该由未来的引力波干涉仪进行测试。

英文摘要:

We explain in detail how to calculate the gravitational mass and angular momentum multipoles of the most general non-extremal four-dimensional black hole with four magnetic and four electric charges. We also calculate these multipoles for generic supersymmetric four-dimensional microstate geometries and multi-center solutions. Both for Kerr black holes and BPS black holes many of these multipoles vanish. However, if one embeds these black holes in String Theory and slightly deforms them, one can calculate an infinite set of ratios of vanishing multipoles which remain finite as the deformation is taken away, and whose values are independent of the direction of deformation. For supersymmetric black holes, we can also compute these ratios by taking the scaling limit of multi-center solutions, and for certain black holes the ratios computed using the two methods agree spectacularly. For the Kerr black hole, these ratios pose strong constraints on the parameterization of possible deviations away from the Kerr geometry that should be tested by future gravitational wave interferometers.

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