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arXiv 2101.10652hep-thgr-qc
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AdS/CFT correspondence中NUT荷电黑膜的拟正规模

Quasinormal modes of NUT-charged black branes in the AdS/CFT correspondence

Pablo A. Cano, David Pereñiguez

摘要:

研究了带NUT荷的平面AdS $_4$黑洞的标量、电磁和引力扰动.在AdS/CFT对应的上下文中,这些解描述了嵌入在具有闭合类时曲线的哥德尔型宇宙中的热量子场论。对于一个给定的温度和NUT电荷,两个不同的平面Taub-NUT解决方案存在,但我们表明,只有一个具有正比热贡献的欧几里德鞍点的路径积分。利用Newman-Penrose形式,导出了在此背景下标量、电磁和引力摄动所满足的主方程,并证明了相应的方程是可分的。有趣的是,这些解以朗道能级的形式堆积,因此可以用单个量子数$q$来表征。我们确定适当的边界条件满足的主变量,并使用这些我们计算的标量和引力摄动的准正规模式。另一方面,电磁扰动依赖于一个自由参数,其确定是有问题的。我们发现所有的标量和引力QNM频率都位于复平面的下半部分,表明这些Taub-NUT时空是稳定的。我们讨论了这些结果的影响,根据AdS/CFT对应。

英文摘要:

We study the scalar, electromagnetic and gravitational perturbations of planar AdS$_4$ black holes with NUT charge. In the context of the AdS/CFT correspondence, these solutions describe a thermal quantum field theory embedded in a Gödel-type universe with closed time-like curves. For a given temperature and NUT charge, two different planar Taub-NUT solutions exist, but we show that only the one with a positive specific heat contributes to the Euclidean saddle point in the path integral. By using the Newman-Penrose formalism, we then derive the master equations satisfied by scalar, electromagnetic and gravitational perturbations in this background, and show that the corresponding equations are separable. Interestingly, the solutions pile up in the form of Landau levels, and hence are characterized by a single quantum number $q$. We determine the appropriate boundary conditions satisfied by the master variables and using these we compute the quasinormal modes of scalar and gravitational perturbations. On the other hand, electromagnetic perturbations depend on a free parameter whose determination is problematic. We find that all the scalar and gravitational QNM frequencies lie in the lower half of the complex plane, indicating that these Taub-NUT spacetimes are stable. We discuss the implications of these results in the light of the AdS/CFT correspondence.

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