Ergosphere and shadow of a rotating regular black hole

Abstract

The spacetime singularities in classical general relativity predicted by the celebrated singularity theorems are formed at the end of gravitational collapse. Quantum gravity is the expected theory to resolve the singularity problem, but we are now far from it. Therefore attention has shifted to models of regular black holes free from the singularities. A spherically symmetric regular toy model was obtained by Dymnikova (1992) which we demonstrate as an exact solution of Einstein's field equations coupled to nonlinear electrodynamics for a Lagrangian with parameter $b$ related to magnetic charge. We construct rotating counterpart of this solution which encompasses the Kerr black hole as a special case when charge is switched off ($b=0$). Event Horizon Telescope has released the first image of supermassive black hole M87${}^{\ast }$, revealing the structure near black hole horizon. The rotating regular black hole's shadow may be useful to determine strong field regime. We investigate ergosphere and black hole shadow of rotating regular black hole to infer that their sizes are sensitive to charge $b$ and have a richer chaotic structure. In particular, rotating regular black hole possess larger size, but less distorted shadows when compared with Kerr black holes. We find one to one correspondence between ergosphere and shadow of the black hole.

arXiv comment22 pages, 11 figures, 2 tables, accepted for publication in NPB

References in corpus (55)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Formation and evaporation of non-singular black holes
• Viewing the Shadow of the Black Hole at the Galactic Center
• The Bardeen Model as a Nonlinear Magnetic Monopole
• Regular Magnetic Black Holes and Monopoles from Nonlinear Electrodynamics
• Rotating regular black holes
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• Regular electrically charged structures in Nonlinear Electrodynamics coupled to General Relativity
• Photon Regions and Shadows of Kerr-Newman-NUT Black Holes with a Cosmological Constant
• Shadow of rotating regular black holes
• Regular black holes with a nonlinear electrodynamics source
• Generating rotating regular black hole solutions without complexification
• A new method for shadow calculations: application to parameterised axisymmetric black holes
• Apparent shape of super-spinning black holes
• Shadow of a rotating braneworld black hole
• Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
• Shadow of five-dimensional rotating Myers-Perry black hole
• Rotating Regular Black Hole Solution
• Shadow of a Kaluza-Klein rotating dilaton black hole
• Can the supermassive objects at the centers of galaxies be traversable wormholes? The first test of strong gravity for mm/sub-mm VLBI facilities
• Photon Rings around Kerr and Kerr-like Black Holes
• A coordinate-independent characterization of a black hole shadow
• Regular black hole metrics and the weak energy condition
• The Shadow of a Rotating Traversable Wormhole
• Shadow of Kerr-Taub-NUT black hole
• Wormhole Shadows
• Shadows of rotating wormholes
• From static to rotating to conformal static solutions: Rotating imperfect fluid wormholes with(out) electric or magnetic field
• Regular rotating black holes and the weak energy condition
• Generic rotating regular black holes in general relativity coupled to nonlinear electrodynamics
• Shapes of rotating nonsingular black hole shadows
• Shape and position of the shadow in the $\delta =2$ Tomimatsu-Sato space-time
• Shadows of Multi-Black Holes: Analytic Exploration
• On a regular charged black hole with a nonlinear electric source
• Radiating Kerr-like regular black hole
• Shadows of rotating five-dimensional charged EMCS black holes
• Black Hole Shadows of Charged Spinning Black Holes
• Quasinormal modes of test fields around regular black holes
• Testing the Kerr black hole hypothesis
• Electromagnetic perturbations of black holes in general relativity coupled to nonlinear electrodynamics
• Regular and conformal regular cores for static and rotating solutions
• Shadow images of Kerr-like wormholes
• Relaxations of perturbations of spacetimes in general relativity coupled to nonlinear electrodynamics
• Singularities and the Finale of Black Hole Evaporation
• Electromagnetic perturbations of black holes in general relativity coupled to nonlinear electrodynamics: Polar perturbations
• Horizon structure of rotating Bardeen black hole and particle acceleration
• Testing the Bardeen metric with the black hole candidate in Cygnus X-1
• Rotating Ayón-Beato-García black hole as a particle accelerator
• Wormhole Shadows in Rotating Dust
• Non-singular black-holes on the brane
• Shadow of charged wormholes in Einstein-Maxwell-dilaton theory
• Collision of two general particles around a rotating regular Hayward's black holes
• Particle acceleration of two general particles in the background of rotating Ayón-Beato-García black holes

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• Shadows and rings of the Kehagias-Sfetsos black hole surrounded by thin disk accretion
• The classical double copy of non-singular black holes
• Quest for realistic non-singular black-hole geometries: Regular-center type
• From a locality-principle for new physics to image features of regular spinning black holes with disks
• Photon regions, shadow observables and constraints from M87* of a charged rotating black hole
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• Quasinormal Modes and GUP-Corrected Hawking Radiation of BTZ Black Holes within Modified Gravity Frameworks
• Quasinormal modes and gray-body factors of regular black holes in asymptotically safe gravity
• Rotating black holes in general relativity coupled to nonlinear electrodynamics
• Shadows and precession of orbits in rotating Janis-Newman-Winicour spacetime
• Geodesic motion around hairy black holes
• Estimating the cosmological constant from shadows of Kerr--de Sitter black holes
• Shadow of regular black hole in scalar-tensor-vector gravity theory
• Five dimensional rotating regular black holes and shadow
• Criteria for energy conditions
• On new regular charged black hole solutions: Limiting Curvature Condition, Quasinormal modes and Shadows
• Modeling the black holes surrounded by a dark matter halo in the galactic center of M87
• Geodesic analysis and black hole shadows on a general non--extremal rotating black hole in five--dimensional gauged supergravity
• Shadows and parameter estimation of rotating quantum corrected black holes and constraints from EHT observation of M87* and Sgr A*
• Massless Dirac Perturbations of black holes in f(Q) gravity: quasinormal modes and weak deflection angle
• Image of Quantum Improved Regular Kerr Black Hole and Parameter Constraints from EHT Observations
• Greybody factor for an electrically charged regular-de Sitter black holes in $d$-dimensions
• Investigating the existence of gravitomagnetic monopole in M87*
• Compact regular objects from an electrified Tolman-like density: A new interior region for the Kerr-Newman spacetime
• Imaging the destruction of a rotating regular black hole
• Shadow of topologically charged rotating braneworld black hole
• Shadows of generalised Hayward spacetimes : in vacuum and with plasma
• Kerr-Sen-like Lorentz violating black holes and Superradiance phenomena
• Regular Kerr black holes: Junction conditions and the matter content across the ring