Axial perturbations of black holes with primary scalar hair

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Christos Charmousis, Simon Iteanu, David Langlois, Karim Noui
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引用次数: 0

Abstract

We study axial perturbations of static black holes with primary hair in a family of degenerate higher-order scalar-tensor (DHOST) theories. These solutions possess a scalar charge, fully independent of the mass, leading to a continuous one-parameter deformation of the standard Schwarzschild black hole. Starting from these solutions, we also construct new black holes, solutions of other DHOST theories, obtained via disformal transformations of the metric. In particular, we investigate two specific types of disformal transformations: the first leading to a theory where gravitational waves propagate at the speed of light, the second to a Horndeski theory, where the equations of motion remain second order. The dynamics of axial perturbations can be formally related to the general relativistic equations of motion of axial perturbations in an effective metric. The causal structure of the effective metric differs from that of the background metric, leading to distinct gravitational and luminous horizons. Using a WKB approximation, we compute the quasi-normal modes for the Schrödinger-like equation associated with the effective metric outside the gravitational horizon.
带原生标量毛的黑洞轴向微扰
本文研究了一类简并高阶标量张量(DHOST)理论中具有原发的静态黑洞的轴向摄动。这些解具有标量电荷,完全独立于质量,导致标准史瓦西黑洞的连续单参数变形。从这些解出发,我们还构造了新的黑洞,其他DHOST理论的解,通过度量的非形式化变换得到。特别地,我们研究了两种特定类型的不规则变换:第一种导致引力波以光速传播的理论,第二种导致霍恩戴斯基理论,其中运动方程仍然是二阶的。轴向摄动的动力学可以形式化地与有效度规中轴向摄动的广义相对论运动方程联系起来。有效度规的因果结构不同于背景度规,导致不同的引力视界和发光视界。使用WKB近似,我们计算了与引力视界外有效度量相关的Schrödinger-like方程的准正态模态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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