(In)stability of the charged massive scalar field on the Kerr-Newman spacetime

Vieira, H. S.; Bezerra, V. B.; Muniz, C. R.

doi:10.48550/arxiv.2107.02562

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…In principle, the occurence of superradiance does not necessarily imply that the spacetime itself will be destabilized. Nonetheless, BH superradiant instabilities do appear when these waves are confined in negative potential wells [29][30][31][32][33][34][35][36][37][38] or when the boundary conditions are altered [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. Under such circumstances, perturbations grow exponentially and lead to the formation of BH bombs [56].…”

Section: Introductionmentioning

confidence: 99%

Charged black holes in de Sitter space: Superradiant amplification of charged scalar waves and resonant hyperradiation

2022

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Black holes typically inhabit highly dynamical galactic environments and are frequently permeated by accretion media. The inevitable scattering of scalar, electromagnetic and gravitational waves off rotating and charged black holes provides a remarkable demonstration of the energy extraction and subsequent amplification of scattered waves under the expense of the compact object's rotational and electromagnetic energy; a phenomenon known as superradiance. Certain circumstances tremendously favor the energy extraction process in such extent that linear superradiant instabilities are triggered. We examine the superradiant amplification of monochromatic charged scalar fields impinging Reissner-Nordström-de Sitter black holes which are known to exhibit superradiantly unstable quasinormal modes. We find that even though the frequency range of superradiance is reduced when a positive cosmological constant is incorporated, the amplification factors are significantly elevated with respect to those occurring in Reissner-Nordström spacetime. Intriguingly, we confirm that the long-lived quasinormal resonances that reside in the superradiant regime induce resonant peaks when the wave's frequency matches the real part of the quasinormal mode, regardless of the spacetime's modal stability.

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Section: Introductionmentioning

confidence: 99%

Charged black holes in de Sitter space: Superradiant amplification of charged scalar waves and resonant hyperradiation

2022

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“…The mechanism of reflection toward a black hole is commonly created by the rest mass of the perturbing field naturally, and either artificially by a reflector surface such as a mirror or cavity, see Refs. [33]- [42]. The asymptotically Anti-desitter (AdS) spacetime is also a natural bed to make the reflecting boundary for waves since the spatial infinity is at a finite distance causally, resulting in the formation of a time-like boundary [43]- [48].…”

Section: Introductionmentioning

confidence: 99%

Lifetime of scalar cloud formation around a rotating regular black hole

Khodadi

Pourkhodabakhshi

2022

Phys. Rev. D

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Does circumventing the curvature singularity of the Kerr black hole affects the timescale of the scalar cloud formation around it? By definition, the scalar cloud, forms a gravitational atom with hydrogen-like bound states, lying on the threshold of a massive scalar field's superradiant instability regime (time-growing quasi-bound states) and beyond (time-decaying quasi-bound states). By taking a novel type of rotating hollow regular black hole proposed by Simpson and Visser which unlike its standard rivals has an asymptotically Minkowski core, we address this question. The metric has a minimal extension relative to the standard Kerr, originating from a single regularization parameter , with length dimension. We show with the inclusion of the regularization length scale into the Kerr spacetime, without affecting the standard superradiant instability regime, the timescale of scalar cloud formation gets shorter. Since the scalar cloud after its formation, via energy dissipation, can play the role of a continuum source for gravitational waves, such a reduction in the instability growth time improves the phenomenological detection prospects of new physics because the shorter the time, the more astrophysically important.

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“…The terminology of the BH bomb, in essence, comes from the seminal paper [39] because the radiation trapped between EH and mirror, eventually, will reach a point where the mirror will break, and leads to expelling the radiation outward just like a bomb [40,41]. Although, within the mentioned scenario, the reflecting boundary condition is artificially provided by a mirror, it is well-known that the Anti-de-sitter (AdS) spacetime as well as the massive scalar field, are able to play such a role naturally [42]- [55] (see also references therein). One of the interesting theoretical consequences of the superradiant instabilities is the possibility of the appearance of the novel BH solutions with additional parameters violating the no-hair theorem [56]- [60].…”

Section: Introductionmentioning

confidence: 99%

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

Khodadi,

Pourkhodabakhshi

2021

Preprint

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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.

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(In)stability of the charged massive scalar field on the Kerr-Newman spacetime

Cited by 3 publications

References 15 publications

Charged black holes in de Sitter space: Superradiant amplification of charged scalar waves and resonant hyperradiation

Charged black holes in de Sitter space: Superradiant amplification of charged scalar waves and resonant hyperradiation

Lifetime of scalar cloud formation around a rotating regular black hole

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

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