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arXiv 2008.13370gr-qc
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Kerr-Vaidya黑洞

Kerr-Vaidya black holes

Pravin Kumar Dahal, Daniel R. Terno

摘要:

Kerr-Vaidya度量是Kerr度量的最简单的非平稳扩展。我们探讨了它们的性质,并将它们与蒸发和吸积物理黑洞的球对称自洽解(质量递减的传入Vaidya度规和质量递增的传出Vaidya度规)的近视界极限进行了比较. Newman-Janis变换将对应的Vaidya和Kerr-Vaidya度量联系起来。对于非零角动量,能量-动量张量违反零能量条件(NEC)。然而,我们表明,它的结构不同于标准形式的NEC违反张量。在即将离去的克尔-瓦伊迪亚度规中的视视界与克尔黑洞的视视界重合。对于传入度量,其位置不同。我们推导出这个表面的常微分方程,并将其数值定位。一个球对称的吸积黑洞导致一个防火墙--一个发散的能量密度、压力和通量,就像一个下落的观察者所感知的那样。我们证明了这对于外向的Kerr-Vaidya度量也是成立的

英文摘要:

Kerr-Vaidya metrics are the simplest nonstationary extensions of the Kerr metric. We explore their properties and compare them with the near-horizon limits of the spherically symmetric self-consistent solutions (the ingoing Vaidya metric with decreasing mass and the outgoing Vaidya metric with increasing mass) for the evaporating and accreting physical black holes. The Newman-Janis transformation relates the corresponding Vaidya and Kerr-Vaidya metrics. For nonzero angular momentum, the energy-momentum tensor violates the null energy condition (NEC). However, we show that its structure differs from the standard form of the NEC-violating tensors. The apparent horizon in the outgoing Kerr-Vaidya metric coincides with that of the Kerr black hole. For the ingoing metric, its location is different. We derive the ordinary differential equation for this surface and locate it numerically. A spherically symmetric accreting black hole leads to a firewall -- a divergent energy density, pressure, and flux as perceived by an infalling observer. We show that this is also true for the outgoing Kerr-Vaidya metric

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