Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Konoplya, R. A.

doi:10.1103/physrevd.103.044033

Cited by 12 publications

(2 citation statements)

References 60 publications

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“…. .. Time-domain evolution of perturbations in the presence of such effective dark matter term ν = 0 [41] indicates that the non-oscillatory long-lived modes should exist in this case as well, supporting the above assumption.…”

Section: Jcap11(2022)028supporting

confidence: 66%

How general is the strong cosmic censorship bound for quasinormal modes?

Konoplya

Zhidenko

2022

J. Cosmol. Astropart. Phys.

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Hod's proposal claims that the least damped quasinormal mode of a black hole must have the imaginary part smaller than half of the surface gravity at the event horizon. The Strong Cosmic Censorship in General Relativity implies that this bound must be even weaker: half of the surface gravity at the Cauchy horizon. The appealing question is whether these bounds are limited by the Einstein theory only? Here we will present numerical evidence that once the black hole size is much smaller than then the radius of the cosmological horizon, both the Hod's proposal and the strong cosmic censorship bound for quasinormal modes are satisfied for general spherically symmetric black holes in an arbitrary metric theory of gravity. The low-lying quasinormal frequencies have the universal behavior in this regime and do not depend on the near-horizon geometry, but only on the asymptotic parameters: the value of the cosmological constant and black hole mass.

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Section: Jcap11(2022)028supporting

confidence: 66%

How general is the strong cosmic censorship bound for quasinormal modes?

Konoplya

Zhidenko

2022

J. Cosmol. Astropart. Phys.

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“…This stage is of great significance for studying the stability of black holes. To date, a large number of papers have studied QNMs and power law tails in different spacetime backgrounds using various methods [6,[27][28][29][30][31][32]. For example, a recent paper [29] studied the QNMs of a Schwarz-schild-like black hole with the cosmological constant in conformal Weyl gravity and found that the evolution of the scalar field is divided into three stages: the Schwarzschild ringing stage, effective dark matter ringing stage, and an exponential tail of de Sitter stage.…”

Section: Introductionmentioning

confidence: 99%

Quasinormal modes of Bardeen black holes with a cloud of strings*

Liu 刘,

Zhang 张

2023

Chinese Phys. C

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We investigate the quasinormal mode and greybody factor of Bardeen black holes with a string clouds by WKB approximation and verify them by Prony algorithm. We found that the imaginary part of the quasinormal modes spectra is always negative and the perturbation does not increase with the time, indicating that the system is stable under scalar field perturbation. Moreover, the string parameter $a$ has a dramatically impact on the frequency and decay rate of the waveforms. In addition, the greybody factor becomes larger when $a$ and $\lambda$ increase while $q$ and $l$ decreases. The parameter $\lambda$ and $l$ have a big effect on the tails. Especially, when $l=0$, a de Sitter phase appears at the tail.

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Weak deflection angle, Hawking radiation, greybody bound and shadow cast for static black hole in the framework of f(R) gravity

Mandal

2023

Physics of the Dark Universe

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Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Cited by 12 publications

References 60 publications

How general is the strong cosmic censorship bound for quasinormal modes?

How general is the strong cosmic censorship bound for quasinormal modes?

Quasinormal modes of Bardeen black holes with a cloud of strings*

Weak deflection angle, Hawking radiation, greybody bound and shadow cast for static black hole in the framework of f(R) gravity

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