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arXiv 2103.17253hep-th
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Dirichlet浴与非细粒度Page曲线

Dirichlet Baths and the Not-so-Fine-Grained Page Curve

Kausik Ghosh, Chethan Krishnan

摘要:

提出了一种计算引力膜上纠缠熵的双全息方法。它涉及一个Ryu-Takayanagi曲面与Dirichlet锚定条件。在膜世界宇宙学中,一个相关的方法在arXiv:2007.06551中使用过。在那里,处方自然地计算了一个共同运动的纠缠熵,并被认为解决了宇宙学中黑洞的信息悖论。在本文中,我们表明,狄利克雷处方导致合理的结果,当应用到最近研究的楔形全息设置与重力浴。信息悖论的本质及其在狄利克雷问题中的解决,可以从两个膜上和锚定位置上的引力强度的角度来自然理解。通过将锚滑动到缺陷处,我们证明了重力从锚处扩散的极限是连续的--换句话说,就岛屿物理学而言,锚上的弱重力与没有重力是相同的。膜上的弱引力区和(中等)强引力区被“狄利克雷墙”隔开。我们发现各种极端表面之间存在着错综复杂的相互作用,每当出现信息悖论时,就会有一个岛屿来拯救我们。这是尽管在光谱中存在无质量的引力子。整体的物理学与引力变得“更全息”的口号是一致的,因为它变得更强。我们的观察加强的情况下,传统的佩奇曲线确实是有意义的,在讨论信息悖论在平坦的空间。我们在足够高的维度下工作,使得引力子是非平凡的,我们的结果与arXiv:2005.02993和arXiv:2007.06551中关于引力浴的讨论一致。

英文摘要:

We present a doubly holographic prescription for computing entanglement entropy on a gravitating brane. It involves a Ryu-Takayanagi surface with a Dirichlet anchoring condition. In braneworld cosmology, a related approach was used previously in arXiv:2007.06551. There, the prescription naturally computed a co-moving entanglement entropy, and was argued to resolve the information paradox for a black hole living in the cosmology. In this paper, we show that the Dirichlet prescription leads to reasonable results, when applied to a recently studied wedge holography set up with a gravitating bath. The nature of the information paradox and its resolution in our Dirichlet problem have a natural understanding in terms of the strength of gravity on the two branes and at the anchoring location. By sliding the anchor to the defect, we demonstrate that the limit where gravity decouples from the anchor is continuous -- in other words, as far as island physics is considered, weak gravity on the anchor is identical to no gravity. The weak and (moderately) strong gravity regions on the brane are separated by a "Dirichlet wall". We find an intricate interplay between various extremal surfaces, with an island coming to the rescue whenever there is an information paradox. This is despite the presence of massless gravitons in the spectrum. The overall physics is consistent with the slogan that gravity becomes "more holographic", as it gets stronger. Our observations strengthen the case that the conventional Page curve is indeed of significance, when discussing the information paradox in flat space. We work in high enough dimensions so that the graviton is non-trivial, and our results are in line with the previous discussions on gravitating baths in arXiv:2005.02993 and arXiv:2007.06551.

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