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arXiv 1908.03351hep-th
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双激发后的纠缠熵作为相互作用度量

Entanglement Entropy after Double-Excitation as Interaction Measure

Yuya Kusuki, Masamichi Miyaji

摘要:

本文研究了二维共形场论中任意中心荷$c>1$的双局域猝灭后的纠缠熵。在全息CFT中,这样一个双激发态与从边界引入两个大质量粒子的AdS空间是对偶的。我们发现,双本地激发后的增长不能由两个本地淬火的总和,但与一个额外的负项。这种负贡献可以自然地解释为由于重力的吸引力。在CFT方面,这种纠缠熵的评估是通过6点函数的特殊限制来完成的,其中我们采用了arXiv:1905.02191中开发的多点共形块的融合矩阵方法。

英文摘要:

We study entanglement entropy after a double local quench in two-dimensional conformal field theories (CFTs), with any central charge $c>1$. In the holographic CFT, such a state with double-excitation is dual to an AdS space with two massive particles introduced from the boundary. We show that the growth after the double local excitations cannot be given by the sum of two local quenches but with an additional negative term. This negative contribution can be naturally interpreted as due to the attractive force of gravity. In CFT side, this evaluation of the entanglement entropy is accomplished by a special limit of 6-point functions, where we employed the fusion matrix approach for multi-point conformal blocks developed in arXiv:1905.02191.

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