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arXiv 1609.07153hep-th
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Virasoro块体的晚时行为和半经典鞍区的分类

On the Late-Time Behavior of Virasoro Blocks and a Classification of Semiclassical Saddles

A. Liam Fitzpatrick, Jared Kaplan

摘要:

最近的工作表明,在AdS $_3$ /CFT $_2$中的黑洞热力学和信息丢失/恢复几乎可以完全从Virasoro共形块在大中心荷下的行为导出,而对CFT谱或OPE系数的精确细节的依赖相对较小。在这里,我们详细说明Virasoro块的非微扰行为,通过分类所有的“鞍”,可以为任意值的外部和内部运营商的尺寸在半经典大中心荷限制。决定Virasoro块的朴素半经典行为的主导鞍点,在后期都以指数衰减,并且以独立于内部算子尺寸的速率衰减。因此,半经典贡献的高能量状态并没有解决一个众所周知的版本的信息损失问题的AdS $_3$。然而,我们识别了两个无限类的子领先鞍点,其中一类在后期不会衰减。

英文摘要:

Recent work has demonstrated that black hole thermodynamics and information loss/restoration in AdS$_3$/CFT$_2$ can be derived almost entirely from the behavior of the Virasoro conformal blocks at large central charge, with relatively little dependence on the precise details of the CFT spectrum or OPE coefficients. Here, we elaborate on the non-perturbative behavior of Virasoro blocks by classifying all `saddles' that can contribute for arbitrary values of external and internal operator dimensions in the semiclassical large central charge limit. The leading saddles, which determine the naive semiclassical behavior of the Virasoro blocks, all decay exponentially at late times, and at a rate that is independent of internal operator dimensions. Consequently, the semiclassical contribution of high-energy states does not resolve a well-known version of the information loss problem in AdS$_3$. However, we identify two infinite classes of sub-leading saddles, and one of these classes does not decay at late times.

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