Scalar field perturbation around a rotating hairy black hole: quasinormal modes, quasibound states and superradiant instability

Lei, Yun-He; Yang, Zhen-Hao; Kuang, Xiao-Mei

doi:10.1140/epjc/s10052-024-12814-6

Cited by 3 publications

(1 citation statement)

References 74 publications

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“…In this section, we consider the QNMs boundary condition, i.e., w m = q i 2 2 in equation (11), and numerically study the QNMs of the system consisting of MPBH and massive scalar perturbation [57][58][59][60][61]. As mentioned in the reviews [1,2], there are a series of methods to calculate QNMs.…”

Section: Numerical Analysis About Qnmsmentioning

confidence: 99%

Five-dimensional Myers-Perry black holes under massive scalar perturbation: bound states and quasinormal modes

Li,

Lu,

LiMing

et al. 2024

Phys. Scr.

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The stability of five-dimensional singly rotating Myers-Perry Black Holes against massive scalar perturbations is studied. Both the quasibound states and quasinormal modes of the massive scalar field are considered. For the quasibound states, we use an analytical method to discuss the effective potential felt by the scalar field, and found that there is no potential well outside the event horizon. Thus, singly rotating Myers-Perry Black Holes are stable against the perturbation of quasibound states of massive scalar fields. Then, we use continued fraction method based on solving a seven-term recurrence relations to compute the spectra of the quasinormal modes.For different values of the black hole rotation parameter $a$, scalar mass parameter $\mu$ and angular quantum numbers, all found quasinormal modesare damped. Besides, when the scalar mass $\mu$ becomes relatively large, the long-living quasiresonances are also found as in other rotating black hole models. Our results complement previous arguments on the stability of five-dimensional singly rotating Myers-Perry black holes against massive scalar perturbations.

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Section: Numerical Analysis About Qnmsmentioning

confidence: 99%

Five-dimensional Myers-Perry black holes under massive scalar perturbation: bound states and quasinormal modes

Li,

Lu,

LiMing

et al. 2024

Phys. Scr.

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Quasi-normal modes of loop quantum black holes formed from gravitational collapse

Zhang,

Wang

2024

J. Cosmol. Astropart. Phys.

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In this paper, we study the quasi-normal modes (QNMs) of a scalar field in the background of a large class of quantum black holes that can be formed from gravitational collapse of a dust fluid in the framework of effective loop quantum gravity. The loop quantum black holes (LQBHs) are characterized by three free parameters, one of which is the mass parameter, while the other two are purely due to quantum geometric effects. Among these two quantum parameters, one is completely fixed by black hole thermodynamics and its effects are negligible for macroscopic black holes, while the second parameter is completely free (in principle). In the studies of the QNMs of such LQBHs, we pay particular attention to the difference of the QNMs between LQBHs and classical ones, so that they can be observed for the current and forthcoming gravitational wave observations, whereby place the LQBH theory directly under the test of observations.

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Polarized image of a synchrotron emitting ring around a static hairy black hole in Horndeski theory

Shi,

Zhu

2024

Eur. Phys. J. C

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In this paper, we investigate the polarization images of a synchrotron-emitting fluid ring surrounding a static hairy black hole within the framework of Horndeski’s theory. Our findings indicate that the characteristics of these polarization images are predominantly influenced by the hairy parameter, alongside the magnetic field near the black hole, the fluid’s velocity, and the observer’s inclination angle. Specifically, the hairy parameter primarily affects the polarized intensity and the apparent radius of the ring in the images. Conversely, the impacts of the magnetic field, fluid velocity, and inclination angle on the polarization images are found to be independent of the hairy parameter and closely resemble those observed in the context of Schwarzschild black holes. Additionally, the polarization direction is significantly influenced by the magnetic field orientation, while the inclination angle crucially determines the apparent flatness of the images. Variations in the fluid velocity direction also markedly affect the trend in polarized intensity. Furthermore, we explore how these parameters influence the Stokes $$Q-U$$ Q - U loops, revealing distinct behaviors in response to changes in the aforementioned variables. This comprehensive analysis enhances our understanding of the intricate dynamics and observational signatures of black holes within alternative gravitational theories.

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Scalar field perturbation around a rotating hairy black hole: quasinormal modes, quasibound states and superradiant instability

Cited by 3 publications

References 74 publications

Five-dimensional Myers-Perry black holes under massive scalar perturbation: bound states and quasinormal modes

Five-dimensional Myers-Perry black holes under massive scalar perturbation: bound states and quasinormal modes

Quasi-normal modes of loop quantum black holes formed from gravitational collapse

Polarized image of a synchrotron emitting ring around a static hairy black hole in Horndeski theory

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