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arXiv 1810.01802hep-thgr-qc
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引力分区的超选择扇区

Superselection Sectors of Gravitational Subregions

Joan Camps

摘要:

受引力子纠缠熵定义问题的启发,我们研究了广义相对论相空间的分区问题。我们的关键要求是要求分区是虚构的-即,纠缠的表面不是物理的。这转化为辛形式上的特定条件。我们发现满足这个条件的引力子区域以极端面积的表面为界。我们将引力子相空间的“中心变量”置于这样的子系统中,它可以被看作是边界中诱导度量的共形类,受涉及非本征曲率的无痕部分的约束。我们认为,这个条件的工程,以放弃局部变形的边界曲面无穷附近的极值曲面,否则可用于通用余维-2极值曲面的尺寸$\geq$ 2。

英文摘要:

Motivated by the problem of defining the entanglement entropy of the graviton, we study the division of the phase space of general relativity across subregions. Our key requirement is demanding that the separation into subregions is imaginary---i.e., that entangling surfaces are not physical. This translates into a certain condition on the symplectic form. We find that gravitational subregions that satisfy this condition are bounded by surfaces of extremal area. We characterise the 'centre variables' of the phase space of the graviton in such subsystems, which can be taken to be the conformal class of the induced metric in the boundary, subject to a constraint involving the traceless part of the extrinsic curvature. We argue that this condition works to discard local deformations of the boundary surface to infinitesimally nearby extremal surfaces, that are otherwise available for generic codimension-2 extremal surfaces of dimension $\geq$ 2.

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