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Regular black holes: A short topic review
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The essential singularity in Einstein's gravity can be avoidable if the preconditions of Penrose's theorem can be bypassed, i.e., if the strong energy condition is broken in the vicinity of a black hole center. The singularity mentioned here includes two aspects: (i) the divergence of curvature invariants, and (ii) the incompleteness of geodesics. Both aspects are now taken into account in order to determine whether a black hole contains essential singularities. In this sense, black holes without essential singularities are dubbed regular (non-singular) black holes. The regular black holes have some intriguing phenomena that are different from those of singular black holes, and such phenomena have inspired numerous studies. In this review, we summarize the current topics that are associated with regular black holes.
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Cited by 15 Pith papers
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A parity selection rule for regular black holes
Spherically symmetric gravity theories can carry generic matter through a regular center only if their defining functions have GR-like parity (α even, β odd in r), equivalent at the metric level to f(−r,−M)=f(r,M); Ha...
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Regular black holes from pure gravity in four dimensions
A construction of four-dimensional pure-gravity actions whose vacuum solutions include the Hayward and Dymnikova regular black holes, via a lift from two-dimensional Horndeski theory.
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On the logarithmic Love number of black holes beyond general relativity
Logarithmic black hole Love numbers are fixed directly by the Taylor coefficients of the perturbation equation, and perturbative deviations from Schwarzschild/Reissner-Nordström force non-zero running.
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Cauchy Horizon (In)Stability of Regular Black Holes
For regular black holes, the Cauchy horizon mass typically grows exponentially or as a power law; for the asymptotically safe collapse model it grows logarithmically, reaching the horizon without a transient mass-infl...
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Quasibound states of a charged Dirac field around regular black holes
Charged massive Dirac quasibound modes on ABG black holes stay damped; ABG and RN share hydrogenic real frequencies, but ABG’s inner barrier can make some modes much longer-lived.
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Internal structure of Hayward black holes
In Hayward regular black holes, a sufficiently strong scalar-field perturbation collapses the inner horizon and forms a spacelike singularity, with the horizon radius obeying a universal |p-p*|^{0.5} scaling near the ...
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Scalarization of Bardeen spacetime
For scalarization of the full Bardeen spacetime, small magnetic charges give the usual smooth scalarization threshold, while large charges end in a 'frozen' horizonless scalarized state rather than a Bardeen black hole.
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Bondi accretion disk luminosity around neutral and charged Simpson-Visser spacetimes
Bondi accretion is computed in Simpson-Visser and charged Simpson-Visser spacetimes, but the reported critical (sonic) radii are not supported by the paper's own equations.
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Null geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes
In the Lorentzian-Euclidean black hole, photons and massive particles are claimed to be unable to cross the event horizon, making the spacetime geodesically complete and avoiding the central singularity.
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Regular Spacetimes in the Effective Metric Description
Within the Effective Metric Description, the paper derives regularity conditions at the origin and horizons, a necessary geodesic-completeness condition, and a classification of regular cores.
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Long-lived quasinormal frequencies for regular black hole supported by the Einasto profile in the presence of the magnetic field
For Einasto-supported regular black holes, larger effective scalar mass and certain halo parameters suppress the quasinormal damping rate, producing long-lived modes and shifting grey-body factors toward higher frequencies.
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First Law for Nonsingular Black Holes in 2D Dilaton Gravity
For 2D nonsingular dilaton black holes with A=f+c, the first law holds with energy E=-c/2 once the asymptotic time translation is properly normalized.
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Chaotic imprints of dark matter in extreme mass-ratio inspirals
A toy model shows that adding a hand-made angle-dependent force to dark-matter spacetimes produces visual chaos and irregular numerical-Kludge waveforms, but the force is not a realistic dark-matter perturbation.
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Energy Extraction and Evolution of Regular Black Holes: The Case of Bardeen Spacetime
A Bardeen regular black hole could evolve into a singular black hole if a charged Penrose process drains its magnetic charge.
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Hayward Boson Stars
Hayward boson stars exist only when sqrt(beta)/Q > 1.49661, exactly where the vacuum Hayward spacetime has no horizon.
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