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arXiv 2108.08668gr-qcastro-ph.HEhep-thmath-phmath.MP
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真空球对称时空微扰的主函数和方程

Master Functions and Equations for Perturbations of Vacuum Spherically-Symmetric Spacetimes

Michele Lenzi, Carlos F. Sopuerta

摘要:

真空球对称时空的微扰理论是理解黑洞微扰动力学的重要工具。球对称允许标量、矢量和张量谐波中的微扰展开。对于不同宇称和不同谐波数的模式,将得到的微扰方程解耦。此外,对于每个谐波和宇称,微扰方程可以根据满足1+1波动方程的(规范不变)主函数解耦。本文通过在完全一般的微扰规范中的工作,研究了在度量微扰及其一阶导数中是线性的,且满足带势波动方程的最一般的主函数是什么。研究的结果是,对于每个奇偶校验,我们有两个分支的解决方案具有相似的功能。其中一个分支包括已知的结果:在奇宇称情况下,最一般的主函数是Regge-Wheeler和Cunningham-Price-Moncrief主函数的任意线性组合,而在偶宇称情况下,它是Zerilli主函数和另一个我们所知的新主函数的任意线性组合。另一个分支是非常不同的,因为它包括一个无限的收集潜力,这反过来又导致一个独立的收集主人的功能,这取决于潜力。允许电位满足一个非线性常微分方程。最后,所有允许的主函数都是规范不变的,并且可以写成完全协变的形式。

英文摘要:

Perturbation theory of vacuum spherically-symmetric spacetimes is a crucial tool to understand the dynamics of black hole perturbations. Spherical symmetry allows for an expansion of the perturbations in scalar, vector, and tensor harmonics. The resulting perturbative equations are decoupled for modes with different parity and different harmonic numbers. Moreover, for each harmonic and parity, the equations for the perturbations can be decoupled in terms of (gauge-invariant) master functions that satisfy 1+1 wave equations. By working in a completely general perturbative gauge, in this paper we study what is the most general master function that is linear in the metric perturbations and their first-order derivatives and satisfies a wave equation with a potential. The outcome of the study is that for each parity we have two branches of solutions with similar features. One of the branches includes the known results: In the odd-parity case, the most general master function is an arbitrary linear combination of the Regge-Wheeler and the Cunningham-Price-Moncrief master functions whereas in the even-parity case it is an arbitrary linear combination of the Zerilli master function and another master function that is new to our knowledge. The other branch is very different since it includes an infinite collection of potentials which in turn lead to an independent collection master of functions which depend on the potential. The allowed potentials satisfy a non-linear ordinary differential equation. Finally, all the allowed master functions are gauge invariant and can be written in a fully covariant form.

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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