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General Relativity and Quantum Cosmology

arXiv:2111.03316 (gr-qc)
[Submitted on 5 Nov 2021 (v1), last revised 15 Nov 2021 (this version, v2)]

Title:Superradiance and Stability of Kerr Black Hole Enclosed by Anisotropic Fluid Matter

Authors:Mohsen Khodadi, Reza Pourkhodabakhshi
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Abstract:Focusing on the rotating black hole (BH) surrounded by the anisotropic fluid matters; radiation, dust, and dark matter, we study the massive scalar superradiant scattering and the stability in the Kiselev spacetime. Superradiance behavior is dependent on the intensity parameter of the anisotropic matter $K$ in the Kiselev spacetime. By adopting the manifest of low-frequency and low-mass for the scalar perturbation, we find $K<0$ enhances the superradiance scattering within the broader frequency range, compared to $K=0$ while $K>0$ suppresses within the narrower frequency range. As a result, the radiation and dark matter around the rotating BH act as amplifier and attenuator for the massive scalar superradiance, respectively. This is while the dust has a twofold role because of admitting both signs of $K$. Through stability analysis in the light of the BH bomb mechanism, we show in the presence of dark matter, the instability regime of standard Kerr BH ($K=0$) gets improved in favor of stabilization while the radiation and dust do not affect it. In other words, by taking the dark matter fluid around BH into account, we obtain a broader regime that allows the massive scalar field dynamic to enjoy superradiant stability.
Comments: 14 pages, 2 figures
Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Theory (hep-th)
Cite as: arXiv:2111.03316 [gr-qc]
  (or arXiv:2111.03316v2 [gr-qc] for this version)
  https://doi.org/10.48550/arXiv.2111.03316
Journal reference: Physics Letters B 823 (2021) 136775
Related DOI: https://doi.org/10.1016/j.physletb.2021.136775

Submission history

From: Mohsen Khodadi [view email]
[v1] Fri, 5 Nov 2021 08:28:22 UTC (196 KB)
[v2] Mon, 15 Nov 2021 08:38:30 UTC (196 KB)
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