Generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics

Toshmatov, Bobir; Stuchlík, Zdeněk; Ahmedov, Bobomurat

doi:10.1103/physrevd.95.084037

Cited by 130 publications

(95 citation statements)

References 99 publications

(179 reference statements)

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“…Recently, one of us has proposed a new procedure [77,78], in which one simply drops the complexification step of the Newman-Janis algorithm. The procedure has been applied to various cases [27,40,[77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96]. One of the main purposes of this paper is to construct the rotating LQBH solution by using this new procedure, and then to investigate its main geometric properties and the effects of LQG on the shadow of the rotating LQBH solution.…”

Section: Introductionmentioning

confidence: 99%

Shadow and quasinormal modes of a rotating loop quantum black hole

et al. 2020

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In this paper, we construct an effective rotating loop quantum black hole (LQBH) solution, starting from the spherical symmetric LQBH by applying the Newman-Janis algorithm modified by Azreg-Aïnou's non-complexification procedure, and study the effects of loop quantum gravity (LQG) on its shadow. Given the rotating LQBH, we discuss its horizon, ergosurface, and regularity as r → 0. Depending on the values of the specific angular momentum a and the polymeric function P arising from LQG, we find that the rotating solution we obtained can represent a regular black hole, a regular extreme black hole, or a regular spacetime without horizon (a non-black-hole solution). We also study the effects of LQG and rotation, and show that, in addition to the specific angular momentum, the polymeric function also causes deformations in the size and shape of the black hole shadow. Interestingly, for a given value of a and inclination angle θ0, the apparent size of the shadow monotonically decreases, and the shadow gets more distorted with increasing P . We also consider the effects of P on the deviations from the circularity of the shadow, and find that the deviation from circularity increases with increasing P for fixed values of a and θ0. Additionally, we explore the observational implications of P in comparing with the latest Event Horizon Telescope (EHT) observation of the supermassive black hole, M87*. The connection between the shadow radius and quasinormal modes in the eikonal limit as well as the deflection of massive particles are also considered.

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Section: Introductionmentioning

confidence: 99%

Shadow and quasinormal modes of a rotating loop quantum black hole

et al. 2020

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“…In this frame the stress-energy tensor is naturally diagonal (ρ, P 1 , P 2 , P 3 ), whose components [45,50]. In particular, at the equatorial plane (θ = π/2) they have the following form:…”

Section: Horizon Properties and Weak Energy Conditionmentioning

confidence: 99%

Shadow cast and deflection of light by charged rotating regular black holes

2019

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We discuss the horizon properties, shadow cast, and the weak gravitational lensing of charged rotating regular black holes, which in addition to mass (M ) and rotation parameter (a) have an electric charge (Q) and magnetic charge (g). The considered regular black holes are the generalization of the Kerr (Q = g = 0) and Kerr-Newman (g = 0) black holes. Interestingly, for a given parameter set, the apparent size of the shadow monotonically decreases and the shadow gets more distorted with increasing charge parameter Q. We put constraints on the black hole parameters with the aid of recent M87* shadow observation. The conserved quantities associated with the rotating regular black holes are calculated and also a brief description of the weak gravitational lensing using the Gauss-Bonnet theorem is presented. Interestingly, the deflection angle decreases with the charge of the black hole. Our results vis-à-vis go over to the Kerr and Kerr-Newman black holes in the appropriate limits.

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“…The metric (1) with mass function (2) is used throughout this paper. The magnetic charge can be expressed as [13][14][15]…”

Section: A Generic Black Hole Spacetimementioning

confidence: 99%

“…[14] authors suggested the regular black hole models as the gravitational field of a non-linear electric or * jaroslav.vrba@fpf.slu.cz † ahmadjon@astrin.uz ‡ arman.tursunov@fpf.slu.cz § ahmedov@astrin.uz ¶ zdenek.stuchlik@fpf.slu.cz magnetic monopole. The properties of the rotating analogue of this type black hole have been considered in [15].…”

Section: Introductionmentioning

confidence: 99%

Particle motion around generic black holes coupled to non-linear electrodynamics

et al. 2019

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We study spherically symmetric magnetically charged generic black hole solutions of general relativity coupled to non-linear electrodynamics (NED). For characteristic values of the generic spacetime parameters we give the position of horizons in dependence on the charge parameter, demonstrating separation of the black hole and no-horizon solutions, and possibility of existence of solutions containing three horizons. We show that null, weak and strong energy conditions are violated when the outer horizon is approaching the center. We study effective potentials for photons and massive test particles and location of circular photon orbits (CPO) and innermost stable circular orbit (ISCO). We show that the unstable photon orbit can become stable, leading to the possibility of photon capture which affects on silhouette of the central object. The position of ISCO approaches the horizon with increasing charge parameter q and the energy at ISCO decreases with increasing charge parameter. We investigate this phenomenon and summarize for a variety of the generic spacetime parameters the upper estimate on the spin parameter of the Kerr black which can be mimicked by the generic charged black hole solutions.

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Generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics

Cited by 130 publications

References 99 publications

Shadow and quasinormal modes of a rotating loop quantum black hole

Shadow and quasinormal modes of a rotating loop quantum black hole

Shadow cast and deflection of light by charged rotating regular black holes

Particle motion around generic black holes coupled to non-linear electrodynamics

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