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arXiv 2604.20165hep-thgr-qc
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熵界与纠缠岛屿的非普遍性

Entropy bound and the non-universality of entanglement islands

Indian Institute of Technology Gandhinagar(印度理工学院甘地纳加尔分校)

Naman Kumar

AI总结:

研究探讨了通过修改霍金辐射的纠缠楔来解决AMPS防火墙悖论的非普遍性问题,发现无法通过单一紧凑岛屿支持所有相关辐射区域,导致矛盾结果。

摘要:

纠缠岛屿通过修改霍金辐射的纠缠楔来解决AMPS防火墙悖论,但研究显示这种解决方式无法普遍化,因为合理假设下会迫使固定紧凑区域内的内部伴侣熵积累超过贝肯斯坦-霍金界。然而,至少一个辐射区域的本真半经典岛屿实现可能与半经典熵界兼容,从而产生矛盾,得出关于普遍紧凑岛屿的条件否定结果。

英文摘要:

The island prescription reproduces the Page curve and avoids the Almheiri--Marolf--Polchinski--Sully (AMPS) monogamy conflict for suitable radiation subsystems by placing the corresponding interior partners in their entanglement wedges. This mechanism is intrinsically region-dependent. We define a common compact semiclassical support as a finite semiclassical domain that contains representatives of the interior partners of a chosen family of late Hawking modes, while each radiation subsystem need reconstruct only its own partner. We ask whether these separate mode-by-mode reconstructions can be represented within such a common support at a fixed evaporation epoch. The physical motivation is that horizon normalcy---the requirement that the horizon remain smooth for an infalling observer and that semiclassical effective field theory remain valid across it---is a local property, whereas the island condition that resolves AMPS for a given late mode depends on the radiation subsystem used for reconstruction. Using a bounded null realization of the common support together with the quantum Bousso bound, we show that no regular common compact semiclassical support can realize all of the relevant AMPS partner sectors once the support enters the hyperentropic regime. The argument is formulated entirely within the semiclassical region in which the AMPS setup is valid and does not require extending the null surface to the Planckian singularity.

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