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arXiv 2112.08400gr-qchep-th
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荷电黑洞的Love数和磁化率

Love numbers and magnetic susceptibility of charged black holes

David Pereñiguez, Vitor Cardoso

摘要:

黑洞对伴星的反应在它们的动力学和引力波发射的背景下具有根本的重要性。在这里,我们探讨了电荷对黑洞静态响应的影响。为了约束更广泛的设置,我们考虑在任意数量的时空维度$D\geq4$的荷电几何。张量潮汐勒夫数在黑洞温度$\sim T_{H}^{2l+1}$中遵循幂律,在极值处消失.相反,黑洞电荷$Q$在矢量扇区中激发新的偏振模式,否则这些模式在中性极限中不会响应。在四维空间中,勒夫数和磁磁化率对于所有遵守极值约束的电荷值都为零。利用Fuchsian方程的理论,我们能够在大多数情况下得到分析结果,甚至超出超几何的情况。

英文摘要:

The response of black holes to companions is of fundamental importance in the context of their dynamics and of gravitational-wave emission. Here, we explore the effect of charge on the static response of black holes. With a view to constraining broader setups, we consider charged geometries in an arbitrary number of spacetime dimensions $D\geq4$. Tensor tidal Love numbers are shown to follow a power law in the black hole temperature $\sim T_{H}^{2l+1}$, and thus vanish at extremality. In contrast, the black hole charge $Q$ excites new modes of polarisation in the vector sector that are otherwise not responsive in the neutral limit. In four dimensions, Love numbers and magnetic susceptibilities vanish for all values of the charge that respect the extremality bound. Using the theory of Fuchsian equations we are able to obtain analytical results in most cases, even beyond the hypergeometric instances.

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