Gravitoelectromagnetic coupled perturbations and quasinormal modes of a charged black hole with scalar hair

Guo, Wen-Di; Tan, Qin; Liu, Yu-Xiao

doi:10.1103/physrevd.107.124046

Cited by 3 publications

(1 citation statement)

References 72 publications

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“…Inserting the harmonic expansion of the metric perturbation (3.2) and the vector perturbation (3.3) into the linearized field equations (2.8) and (2.10), one can obtain all components of the equations. In fact, there is no reason to consider that the axial and polar parts will not be automatically separated [38][39][40][41][42]. However, by separating the angular dependence [43], a system of fourteen coupled pure radial equations can be obtained.…”

Section: Jcap11(2023)057mentioning

confidence: 99%

Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: quasinormal modes and ringdown waveforms

Liu,

Fang,

Jing

et al. 2023

J. Cosmol. Astropart. Phys.

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In this paper, we present a black hole solution with a cosmological constant in the Scalar-Tensor-Vector Modified Gravity (MOG) theory, where the strength of the gravitational constant is determined by G = G N(1 + α). We derive the master equations for gravito-electromagnetic perturbations and numerically solve for the Quasinormal Mode (QNM) spectrum and the ringdown waveforms. Our research results show that increasing the MOG parameter α leads to a decrease in both the real and imaginary parts of the QNM frequencies for electromagnetic and gravitational modes. Similarly, increasing the cosmological constant Λ also results in a decrease in both the real and imaginary parts of the QNM frequencies for these modes. These trends are observed when compared to standard Schwarzschild-de Sitter (S-dS) or MOG black holes, respectively. Meanwhile, the result indicates that in the MOG-de Sitter spacetime, the frequencies for electromagnetic and gravitational modes display isospectrality, and exhibit the same ringdown waveforms. Our findings have implications for the ringdown phase of mergers involving massive compact objects, which is of particular relevance given the recent detections of gravitational waves by LIGO.

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Section: Jcap11(2023)057mentioning

confidence: 99%

Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: quasinormal modes and ringdown waveforms

Liu,

Fang,

Jing

et al. 2023

J. Cosmol. Astropart. Phys.

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Can we distinguish black holes with electric and magnetic charges from quasinormal modes?

De Felice,

Tsujikawa

2024

Phys. Rev. D

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The effect of scalar hair on the charged black hole with the images from accretions disk

Sui,

Wang,

Guo

2024

Eur. Phys. J. C

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In this paper, we investigate the optical properties of a charged black hole with scalar hair (CSH) within the context of four-dimensional Einstein–Maxwell–Dilaton gravity. To achieve this, we consider three distinct toy models of thin accretion disks. The presence of dilaton coupling allows us to express both the solutions of CSH and the Reissner–Nordström (RN) black hole in terms of their mass (M) and charge (Q). Our findings reveal differences in the effective potentials $$V_{eff}$$ V eff , photon sphere radii $$r_{ph}$$ r ph , and innermost stable circular orbit $$r_{isco}$$ r isco between the CSH and RN black hole cases, which become increasingly pronounced as the charge parameter Q increases. However, no noticeable distinctions are observed concerning the critical impact parameter $$b_{ph}$$ b ph . When the ratio of the photon ring band and the lensed ring band exceeds 0.1, it may suggest the presence of a charged black hole with scalar hair. Furthermore, our results underscore the significant influence of the charge parameter Q on the brightness distributions of the direct, lensed ring, and photon ring for three standard emission functions. These findings emphasize the potential for distinguishing between CSH and RN black holes through an analysis of direct intensity and peak brightness in specific accretion disk models.

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Gravitoelectromagnetic coupled perturbations and quasinormal modes of a charged black hole with scalar hair

Cited by 3 publications

References 72 publications

Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: quasinormal modes and ringdown waveforms

Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: quasinormal modes and ringdown waveforms

Can we distinguish black holes with electric and magnetic charges from quasinormal modes?

The effect of scalar hair on the charged black hole with the images from accretions disk

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