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arXiv 2202.01633hep-th
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边界重算子CFT $_2$的泛动力学

Universal Dynamics of Heavy Operators in Boundary CFT$_2$

Tokiro Numasawa, Ioannis Tsiares

摘要:

我们推导出一个通用的渐近公式的一般边界条件的平均值的体积到边界和边界算子乘积展开系数的任何酉,紧凑的二维边界CFT(BCFT)与$c>1$。渐近极限包括采取一个或多个边界的主要运营商-下的一个单一的副本的维拉索罗代数变换-有固定的中心荷参数大的共形尺寸。特别是,我们找到了\textit{single}通用的表达式,不同的重制度之间的插值,完全一样的情况下,散装OPE渐近\cite{Collier:2019weq}。该表达式普遍依赖于边界熵和中心荷,而不依赖于理论的任何其他细节。通过研究开边界高亏格黎曼曲面上各种关联函数的交叉对称性,我们得到了这些渐近性。在推导过程中,关键是使用交叉内核的无理版本,该交叉内核将不同通道中的全纯Virasoro块联系起来。我们的研究结果强烈建议边界OPE系数的本征态热化假设的扩展版本,其中的对角线和非对角线项之间的层次结构的anterior进一步控制的边界熵。最后,我们评论我们的结果的应用范围内的$\text{AdS}_3/\text{BCFT}_2$,以及最近的关系BCFTs与低维模型的蒸发黑洞。

英文摘要:

We derive a universal asymptotic formula for generic boundary conditions for the average value of the bulk-to-boundary and boundary Operator Product Expansion coefficients of any unitary, compact two-dimensional Boundary CFT (BCFT) with $c>1$. The asymptotic limit consists of taking one or more boundary primary operators -- which transform under a single copy of the Virasoro algebra -- to have parametrically large conformal dimension for fixed central charge. In particular, we find a \textit{single} universal expression that interpolates between distinct heavy regimes, exactly as in the case of bulk OPE asymptotics\cite{Collier:2019weq}. The expression depends universally on the boundary entropy and the central charge, and not on any other details of the theory. We derive these asymptotics by studying crossing symmetry of various correlation functions on higher genus Riemann surfaces with open boundaries. Essential in the derivation is the use of the irrational versions of the crossing kernels that relate holomorphic Virasoro blocks in different channels. Our results strongly suggest an extended version of the Eigenstate Thermalization Hypothesis for boundary OPE coefficients, where the hierarchy between the diagonal and non-diagonal term in the ansatz is further controlled by the boundary entropy. We finally comment on the applications of our results in the context of $\text{AdS}_3/\text{BCFT}_2$, as well as on the recent relation of BCFTs with lower dimensional models of evaporating black holes.

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