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arXiv 2403.19136hep-thgr-qc
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二维蒸发黑洞中的量子聚焦猜想

Quantum focusing conjecture in two-dimensional evaporating black holes

Akihiro Ishibashi, Yoshinori Matsuo, Akane Tanaka

AI总结:

本文在RST模型的二维动态黑洞中定义量子膨胀,并证明考虑岛屿形成时蒸发黑洞满足量子聚焦猜想。

摘要:

我们考虑了二维蒸发黑洞的量子聚焦猜想(QFC)。QFC与广义熵的行为密切相关——广义熵是给定余维二曲面的面积熵与该面积外量子场的纠缠熵之和。在黑洞蒸发的背景下,Hawking辐射的纠缠熵在Page时间之后递减,因此QFC是否在黑洞蒸发过程中成立并不明显,尤其是在Page时间之后。本文作者之一此前在四维球对称动态黑洞模型中探讨了此问题,并证明QFC得到满足。然而,所考虑的背景时空由Vaidya度规近似,且未充分考虑半经典区域中物质的量子效应。QFC是否实际上对半经典Einstein方程的精确解成立仍有待观察。在本文中,我们在Russo-Susskind-Thorlacius(RST)模型的二维动态黑洞中探讨此问题,该模型允许精确求解半经典运动方程。我们首先给出了二维中量子膨胀的合适定义,然后证明了在考虑岛屿形成的情况下,RST模型中的蒸发黑洞满足QFC。

英文摘要:

We consider the quantum focusing conjecture (QFC) for two-dimensional evaporating black holes. The QFC is closely related to the behavior of the generalized entropy -- the sum of the area entropy for a given co-dimension two surface and the entanglement entropy for quantum fields outside the area. In the context of the black hole evaporation, the entanglement entropy of the Hawking radiation is decreasing after the Page time, and therefore it is not obvious whether the QFC holds in the black hole evaporation process especially after the Page time. One of the present authors previously addressed this problem in a four-dimensional spherically symmetric dynamical black hole model and showed that the QFC is satisfied. However the background spacetime considered was approximated by the Vaidya metric, and quantum effects of matters in the semiclassical regime is not fully taken into consideration. It remains to be seen if the QFC in fact holds for exact solutions of the semiclassical Einstein equations. In this paper, we address this problem in a two-dimensional dynamical black hole of the Russo-Susskind-Thorlacius (RST) model, which allows us to solve the semiclassical equations of motion exactly. We first give a suitable definition of the quantum expansion in two-dimensions and then prove that the QFC is satisfied for evaporating black holes in the RST model with the island formation taken into account.

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