Direct imaging rapidly-rotating non-Kerr black holes

Abstract

Recently, two of us have argued that non-Kerr black holes in gravity theories different from General Relativity may have a topologically non-trivial event horizon. More precisely, the spatial topology of the horizon of non-rotating and slow-rotating objects would be a 2-sphere, like in Kerr space-time, while it would change above a critical value of the spin parameter. When the topology of the horizon changes, the black hole central singularity shows up. The accretion process from a thin disk can potentially overspin these black holes and induce the topology transition, violating the Weak Cosmic Censorship Conjecture. If the astrophysical black hole candidates are not the black holes predicted by General Relativity, we might have the quite unique opportunity to see their central region, where classical physics breaks down and quantum gravity effects should appear. Even if the quantum gravity region turned out to be extremely small, at the level of the Planck scale, the size of its apparent image would be finite and potentially observable with future facilities.

6 pages, 4 figures. v2: published version

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Cited by in corpus (49)

• Shadow of rotating regular black holes
• Testing black hole candidates with electromagnetic radiation
• 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
• Constraining the spin and the deformation parameters from the black hole shadow
• Black Hole Based Tests of General Relativity
• Measuring the Kerr spin parameter of regular black holes from their shadow
• A code to compute the emission of thin accretion disks in non-Kerr space-times and test the nature of black hole candidates
• Non-singular quantum-inspired gravitational collapse
• Black Hole Shadow of Sgr A${}^{\ast }$ in Dark Matter Halo
• Testing the space-time geometry around black hole candidates with the analysis of the broad K$\alpha$ iron line
• Rotating Black Hole Shadow in Perfect Fluid Dark Matter
• Sgr A* and General Relativity
• Probing the space-time geometry around black hole candidates with the resonance models for high-frequency QPOs and comparison with the continuum-fitting method
• On generic parametrizations of spinning black-hole geometries
• Testing the Kerr black hole hypothesis
• Testing the Kerr-nature of stellar-mass black hole candidates by combining the continuum-fitting method and the power estimate of transient ballistic jets
• Broad K$\alpha$ iron line from accretion disks around traversable wormholes
• K$\alpha$ iron line profile from accretion disks around regular and singular exotic compact objects
• Distinguishing black holes and wormholes with orbiting hot spots
• Regular phantom black hole gravitational lensing
• Shadows of CPR black holes and tests of the Kerr metric
• Measuring the Kerr spin parameter of a non-Kerr compact object with the continuum-fitting and the iron line methods
• Gravitational lensing for a boosted Kerr black hole in the presence of plasma
• Attempt to find a correlation between the spin of stellar-mass black hole candidates and the power of steady jets: relaxing the Kerr black hole hypothesis
• Shadow and Photon Sphere of Black Hole in Clouds of Strings and Quintessence
• Strong gravitational lensing by a rotating non-Kerr compact object
• Singularity avoidance in quantum-inspired inhomogeneous dust collapse
• Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity
• Charged particle motion around a quasi-Kerr compact object immersed in an external magnetic field
• Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes
• Note on a new parametrization for testing the Kerr metric
• Strong deflection lensing by charged black holes in scalar-tensor gravity
• Effects of Born-Infeld electrodynamics on black hole shadows
• Rotating non-Kerr black hole and energy extraction
• Super-spinning compact objects generated by thick accretion disks
• Testing the nature of the supermassive black hole candidate in SgrA* with light curves and images of hot spots
• Weak gravitational lensing: a compact object with arbitrary quadrupole moment immersed in plasma
• Possibility of Identifying Matter around Rotating Black Hole with Black Hole Shadow
• X-ray Probes of Black Hole Accretion Disks for Testing the No-Hair Theorem
• Higher dimensional non-Kerr black hole and energy extraction
• Radiation processes in the vicinity of non-Schwarzschild and non-Kerr black holes
• Constraining the Cardoso-Pani-Rico metric with future observations of SgrA${}^{\ast }$
• Properties of accretion flow in deformed Kerr spacetime
• The Weak Cosmic Censorship Conjecture in Hairy Kerr Black Holes
• Accretion flow in deformed Kerr spacetime: Spectral energy distributions from free-free emission
• Image of Quantum Improved Regular Kerr Black Hole and Parameter Constraints from EHT Observations
• Microlensing Black Hole Shadows
• Kerr-de Sitter Black Holes: Quantum Aspects and Cosmic Censorship Conjecture