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arXiv 1408.6300hep-thgr-qc
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因果性与全息纠缠熵

Causality & holographic entanglement entropy

Matthew Headrick, Veronika E. Hubeny, Albion Lawrence, Mukund Rangamani

摘要:

在任意相对论量子场论中,我们确定了作为空间区域函数的纠缠熵与因果关系相容的条件。然后,我们证明,协变全息纠缠熵处方(其中涉及纠缠熵的边界上的一个给定的空间区域的面积在块体中的某一极值表面)服从这些条件,只要块体服从零能量条件。虽然这一一致性要求对处方的有效性是必要的,但从整体观点来看,这一要求相当重要,因此为处方提供了重要的额外证据。在这个过程中,我们引入了一个余维零体区域,命名为纠缠楔,自然与给定的边界空间区域。我们提出纠缠楔是对应于边界约化密度矩阵的最自然的体区域。

英文摘要:

We identify conditions for the entanglement entropy as a function of spatial region to be compatible with causality in an arbitrary relativistic quantum field theory. We then prove that the covariant holographic entanglement entropy prescription (which relates entanglement entropy of a given spatial region on the boundary to the area of a certain extremal surface in the bulk) obeys these conditions, as long as the bulk obeys the null energy condition. While necessary for the validity of the prescription, this consistency requirement is quite nontrivial from the bulk standpoint, and therefore provides important additional evidence for the prescription. In the process, we introduce a codimension-zero bulk region, named the entanglement wedge, naturally associated with the given boundary spatial region. We propose that the entanglement wedge is the most natural bulk region corresponding to the boundary reduced density matrix.

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