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arXiv 1607.01178hep-th
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旋转BTZ黑洞的广义测地偏差方程和纠缠第一定律

Generalized geodesic deviation equations and an entanglement first law for rotating BTZ black holes

Avirup Ghosh, Rohit Mishra

摘要:

全息纠缠熵(HEE)的变化为纯AdS的小波动给出了在体度规和嵌入的极值表面的变化方面的面积泛函的微扰展开。然而,已知嵌入的变化出现在二阶或更高阶。本文证明了在2+1维情况下,通过考虑时空与扰动之间类空测地线的偏差,可以系统地计算嵌入的这些变化.这里我们把旋转BTZ看作是$AdS_3$上的扰动,并研究其中类空测地线的偏差.我们认为,这些偏差自然产生的“广义测地线偏差方程”的解决方案。利用这一点,我们微扰计算HEE高达二阶的变化,旋转BTZ。该表达式与HRT(Hubeny,Rangamani和Takayanagi)提出的旋转BTZ的HEE变化的小系统尺寸扩展相匹配。我们还写了一个替代形式的纠缠第一定律旋转BTZ。要做到这一点,我们需要超越前面讨论过的微扰级数中的首阶。这正是我们考虑找到一个系统的方法来计算它的原因。为了使我们的结果有一个坚实的基础,我们进一步表明,它是这种替代的第一定律,接近热第一定律在大子系统的大小限制。

英文摘要:

The change in Holographic entanglement entropy (HEE) for small fluctuations about pure AdS is given by a perturbative expansion of the area functional in terms of the change in the bulk metric and the embedded extremal surface. However it is known that change in the embedding appear at second order or higher. In this paper we show that these changes in the embedding can be systematically calculated in the 2+1 dimensional case by accounting for the deviation of the spacelike geodesics between a spacetime and perturbations over it. Here we consider rotating BTZ as perturbation over $AdS_3$ and study deviations of spacelike geodesics in them. We argue that these deviations arise naturally as solutions of a "generalized geodesic deviation equation". Using this we perturbatively calculate the changes in HEE upto second order, for rotating BTZ. This expression matches with the small system size expansion of the change in HEE obtained by HRT (Hubeny, Rangamani and Takayanagi) proposal for rotating BTZ. We also write an alternative form of entanglement first law for rotating BTZ. To do this one needs to go beyond the leading order in the perturbation series discussed above. That's precisely the reason we consider finding a systematic way to calculate it. To put our result on a firm footing we further show that it is this alternative first law that approaches the thermal first law in the large subsystem size limit.

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