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arXiv 1611.04592hep-th
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后期二维CFT配分函数

2D CFT Partition Functions at Late Times

Ethan Dyer, Guy Gur-Ari

摘要:

我们考虑全息$2d$ CFTs中解析连续配分函数$Z(β+ it) Z(β- it)$的后期行为。这是对这些理论及其全息理论中信息损失的探索。我们表明,每个Virasoro字符衰减的时间,所以信息是不是恢复在单个字符的水平。我们确定了一个普遍的衰减的贡献在晚些时候,并推测它描述了通用的混沌$2d$ CFTs的行为,是指数大的中心荷的时间。最近有人建议,在足够晚的时候,人们期望交叉随机矩阵行为。我们估计上界的交叉时间,这表明,衰减是由一个参数较长的后期时间增长。最后,我们讨论了可积理论,并展示了信息是如何在后期恢复的一系列字符。这暗示了一种可能的批量机制,其中信息通过非微扰鞍的无限总和来恢复。

英文摘要:

We consider the late time behavior of the analytically continued partition function $Z(β+ it) Z(β- it)$ in holographic $2d$ CFTs. This is a probe of information loss in such theories and in their holographic duals. We show that each Virasoro character decays in time, and so information is not restored at the level of individual characters. We identify a universal decaying contribution at late times, and conjecture that it describes the behavior of generic chaotic $2d$ CFTs out to times that are exponentially large in the central charge. It was recently suggested that at sufficiently late times one expects a crossover to random matrix behavior. We estimate an upper bound on the crossover time, which suggests that the decay is followed by a parametrically long period of late time growth. Finally, we discuss integrable theories and show how information is restored at late times by a series of characters. This hints at a possible bulk mechanism, where information is restored by an infinite sum over non-perturbative saddles.

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