Regular black holes and topology change

Borde, Arvind

doi:10.1103/physrevd.55.7615

Cited by 224 publications

(231 citation statements)

References 21 publications

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“…Without loss of generality, locally the geometry of a static and spherically symmetric regular black hole can be written as [11,[17][18][19][20][21][22][23][24] …”

Section: Geometric Settingmentioning

confidence: 99%

On the viability of regular black holes

Carballo-Rubio

Filippo

Liberati

et al. 2018

J. High Energ. Phys.

165

146

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The evaporation of black holes raises a number of conceptual issues, most of them related to the final stages of evaporation, where the interplay between the central singularity and Hawking radiation cannot be ignored. Regular models of black holes replace the central singularity with a nonsingular spacetime region, in which an effective classical geometric description is available. It has been argued that these models provide an effective, but complete, description of the evaporation of black holes at all times up to their eventual disappearance. However, here we point out that known models fail to be self-consistent: the regular core is exponentially unstable against perturbations with a finite timescale, while the evaporation time is infinite, therefore making the instability impossible to prevent. We also discuss how to overcome these difficulties, highlighting that this can be done only at the price of accepting that these models cannot be fully predictive regarding the final stages of evaporation.

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“…Without loss of generality, locally the geometry of a static and spherically symmetric regular black hole can be written as [11,[17][18][19][20][21][22][23][24] …”

Section: Geometric Settingmentioning

confidence: 99%

On the viability of regular black holes

Carballo-Rubio

Filippo

Liberati

et al. 2018

J. High Energ. Phys.

165

146

View full text Add to dashboard Cite

show abstract

“…Recently a non-linear electrodynamics lagrangian was found producing a Bardeen type metric [20]. Phenomenological sources for non-singular black holes were discussed in [21,22]. In addition, we mention some investigations on the dynamics of time-dependent bubbles with false vacuum inside (and hence de Sitter metric inside) and a black hole metric outside (for a recent discussion see [23]).…”

Section: Introductionmentioning

confidence: 99%

No-go theorem for false vacuum black holes

Gal’tsov

Lemos

2001

Class. Quantum Grav.

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We study the possibility of non-singular black hole solutions in the theory of general relativity coupled to a non-linear scalar field with a positive potential possessing two minima: a 'false vacuum' with positive energy and a 'true vacuum' with zero energy. Assuming that the scalar field starts at the false vacuum at the origin and comes to the true vacuum at spatial infinity, we prove a no-go theorem by extending a no-hair theorem to the black hole interior: no smooth solutions exist which interpolate between the local de Sitter solution near the origin and the asymptotic Schwarzschild solution through a regular event horizon or several horizons.

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“…When a black hole evaporates the event horizon does not exist and the apparent horizon is closed. Such a model was first proposed in [32], and later was intensively discussed in the literature [16,[33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Quantum radiation from a sandwich black hole

Frolov

Zelnikov

2017

Phys. Rev. D

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We discuss quantum radiation of a massless scalar field from a spherically symmetric nonsingular black hole with finite lifetime. Namely, we discuss a sandwich black-hole model, where a black hole is originally created by a collapse of a null shell of mass M , and later, after some time ∆V , it is disrupted by the collapse of the other shell with negative mass −M . We assume that between the shells the metric is static and either coincides with the Hayward metric or with a special generalization of it. We show that in both cases for sufficiently large parameter ∆V the radiation after the formation of the black hole practically coincides with the Hawking result. We also calculated the radiation, emitted from the black hole interior. This radiation contains peak at the moment when the second shell intersects the inner horizon. In the standard sandwich metric (with the Hayward interior) this outburst of the energy is exponentially large. In the modified metric, which includes additional non-trivial redshift parameter, this exponent is suppressed. This is a result of significant decrease of the surface gravity of the inner horizon in the latter case. We discuss possible consequences of this result in context of the self-consistency requirement for nonsingular models with quantum radiation.

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Regular black holes and topology change

Abstract: The conditions are clarified under which regular (i.e., singularity-free) black holes can exist. It is shown that in a large class of spacetimes that satisfy the weak energy condition the existence of a regular black hole requires topology change.

Cited by 224 publications

References 21 publications

On the viability of regular black holes

On the viability of regular black holes

No-go theorem for false vacuum black holes

Quantum radiation from a sandwich black hole

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