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arXiv 1504.07985hep-th
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二维弦论中的纠缠熵

Entanglement entropy in two dimensional string theory

Sean A. Hartnoll, Edward Mazenc

摘要:

理解突现时空就是理解定域性的突现。纠缠熵是局域性的一个强有力的诊断,因为局域性导致大量的短距离纠缠。二维弦论是涌现空间维的最简单的例子之一。在弱弦耦合的半经典极限下,计算了与二维弦论对偶的大$N$矩阵量子力学中的纠缠熵。我们隔离出一个巨大的,但有限的贡献,对应于短距离纠缠的快子场的紧急时空。从时空的观点来看,纠缠是由空间的非微扰性“颗粒性”所控制的。

英文摘要:

To understand an emergent spacetime is to understand the emergence of locality. Entanglement entropy is a powerful diagnostic of locality, because locality leads to a large amount of short distance entanglement. Two dimensional string theory is among the very simplest instances of an emergent spatial dimension. We compute the entanglement entropy in the large $N$ matrix quantum mechanics dual to two dimensional string theory, in the semiclassical limit of weak string coupling. We isolate a logarithmically large, but finite, contribution that corresponds to the short distance entanglement of the tachyon field in the emergent spacetime. From the spacetime point of view, the entanglement is regulated by a nonperturbative `graininess' of space.

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