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arXiv 2304.03055gr-qcastro-ph.COhep-th
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标量-张量引力中黑洞的轴向微扰:近视界行为

Axial perturbations of black holes in scalar-tensor gravity: near-horizon behaviour

Karim Noui, Hugo Roussille, David Langlois

AI总结:

本文研究移位对称DHOST理论中带毛黑洞的轴向微扰,通过重新表述有效度规并参数化近视界区域,利用类薛定谔算符的自伴性分析时间演化与稳定性,并以两个黑洞解示例验证。

摘要:

我们考虑了移位对称DHOST(退化高阶标量-张量)理论中非旋转带毛黑洞(BH)的轴向(或奇宇称)微扰,其中包括标量场二阶导数中的四次项和三次项。我们给出了有效度规的一种新表述,轴向微扰在其中如同在广义相对论中一样传播。随后,我们引入了背景黑洞视界附近有效度规的一种通用参数化。将微扰动力学写成类薛定谔算符的形式后,我们根据表征近视界有效度规的参数选择,讨论了该算符在何种情况下是(本质)自伴的,从而产生明确的时间演化。这对于研究微扰的稳定性尤其有用。最后,我们用两个黑洞解的例子来说明我们的一般性分析。

英文摘要:

We consider axial (or odd-parity) perturbations of non-spinning hairy black holes (BH) in shift-symmetric DHOST (Degenerate Higher-Order Scalar-Tensor) theories, including terms quartic and cubic in second derivatives of the scalar field. We give a new formulation of the effective metric in which axial perturbations propagate as in general relativity. We then introduce a generic parametrization of the effective metric in the vicinity of the background BH horizon. Writing the dynamics of the perturbations in terms of a Schrödinger-like operator, we discuss in which cases the operator is (essentially) self-adjoint, thus leading to an unambiguous time evolution, according to the choice of parameters characterizing the near-horizon effective metric. This is in particular useful to investigate the stability of the perturbations. We finally illustrate our general analysis with two examples of BH solutions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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