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arXiv 2408.03061hep-thgr-qc
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(A)dS时空中全息伪熵的平直空间极限

Flat-Space Limit of Holographic Pseudo Entropy in (A)dS Spacetimes

Reza Fareghbal

AI总结:

该研究探讨(A)dS时空中全息伪熵的平直空间极限,证明三维情形下该极限良定义,给出从推迟时间极值径向坐标计算曲线长度得到平直时空对偶理论纠缠熵的方法,揭示其与(A)dS对偶CFT伪熵极端相对论极限的关联。

摘要:

共形场论中伪熵的实部,可通过对偶dS和AdS时空中若干极端类空曲面的面积进行全息计算。我们证明,三维(A)dS时空中这些曲线的平直空间极限是良定义的。研究发现,若从推迟时间取极值的径向坐标出发计算曲线长度,取平直空间极限后,可得到三维平直时空对偶理论的纠缠熵。对于dS时空,推迟时间极值对应的径向坐标位于宇宙视界内部。我们的结果表明,在场论层面,平直时空对偶理论中的纠缠熵应通过(A)dS时空对偶CFT中伪熵的极端相对论极限得到。

英文摘要:

The real part of pseudo entropy in conformal field theories is holographically calculated by the area of some extremal spacelike surfaces in the dual dS and AdS spacetimes. We show that the flat-space limit of these curves in three-dimensional (A)dS spacetimes is well defined. We find that if the length of the curves is calculated from the radial coordinate where the retarded time is extremum, then after taking the flat-space limit, the entanglement entropy of the dual theory of three-dimensional flat spacetime is obtained. For dS spacetime, the radial coordinate corresponding to the extremum of retarded time is located inside the cosmological horizon. Our results suggest that on the field theory side, the entanglement entropy in the dual theory of flat spacetimes should be obtained from the ultra-relativistic limit of pseudo entropy in the dual CFT to (A)dS spacetimes.

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