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arXiv 2009.09027hep-thastro-ph.HEgr-qc
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Kerr/CFT对应中的回声

Echoes in the Kerr/CFT correspondence

Ramit Dey, Niayesh Afshordi

摘要:

Kerr/CFT对应是通过对偶全息共形场论(CFT)深入理解Kerr黑洞近视界引力量子理论的一条可能途径。对双全息CFT的黑洞熵、散射截面和准简正模的预言证实了这一对应关系。最近,有人提出,黑洞近视界区域的量子引力效应可能会极大地改变经典的广义相对论描述,导致潜在的可观测后果。本文研究了在对偶CFT图像下类水平克尔奇异紧致天体(ECO)的吸收截面和准简正模。我们的分析表明,黑洞的近视界量子修改可以理解为有限尺寸和/或有限的$N$效应的双重CFT。黑洞几何形状的近视界修正的特征表现为双星黑洞合并的振铃(即合并后阶段)中的延迟回波。从我们的双CFT分析,我们展示了如何的长度的圆,双CFT的生活,必须与回声的时间延迟,取决于近地平线的量子结构的位置。我们进一步推导出的ECO膜的CFT模块化参数的反射率,表明它需要玻尔兹曼形式。

英文摘要:

The Kerr/CFT correspondence is a possible route to gain insight into the quantum theory of gravity in the near-horizon region of a Kerr black hole via a dual holographic conformal field theory (CFT). Predictions of the black hole entropy, scattering cross-section and the quasi normal modes from the dual holographic CFT corroborate this proposed correspondence. More recently, it has been suggested that quantum gravitational effects in the near-horizon region of a black hole may drastically modify the classical general relativistic description, leading to potential observable consequences. In this paper, we study the absorption cross-section and quasi normal modes of a horizonless Kerr-like exotic compact object (ECO) in the dual CFT picture. Our analysis suggests that the near-horizon quantum modifications of the black hole can be understood as finite size and/or finite $N$ effects in the dual CFT. Signature of the near-horizon modification to a black hole geometry manifests itself as delayed echoes in the ringdown (i.e. the postmerger phase) of a binary black hole coalescence. From our dual CFT analysis we show how the length of the circle, on which the dual CFT lives, must be related to the echo time-delay that depends on the position of the near-horizon quantum structure. We further derive the reflectivity of the ECO membrane in terms of the CFT modular parameters, showing that it takes the Boltzmann form.

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