Effective models of nonsingular quantum black holes

Cadoni, Mariano; Oi, Mauro; Sanna, Andrea Pierfrancesco

doi:10.1103/physrevd.106.024030

Cited by 20 publications

(35 citation statements)

References 201 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most general one is that of an anisotropic fluid, which has been widely adopted to effectively parametrize several different effects and deviations from GR phenomenology, both at small and cosmological scales (for an incomplete list, see, e.g. [10,11,13,16,[28][29][30][31][32][33][34] and references therein). This fluid is described by the stress-energy tensor 3…”

Section: Nonsingular Black Holes With a De Sitter Corementioning

confidence: 99%

“…In recent times there has been renewed interest for asymptotically flat, nonsingular black-hole solutions, which deform the Schwarzschild solution at subleading order [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Among them, the most interesting class of solutions is represented by nonsingular black holes with a de Sitter (dS) core [13]. These black-hole solutions are of interest for several reasons.…”

Section: Introductionmentioning

confidence: 99%

“…These deviations are described by an external length scale ℓ, which represents an additional 'hair' of the black hole. An intriguing possibility is that it could be also of super-Planckian origin [13]. Thirdly, they can play the role of black-hole 'mimickers', i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Thirdly, they can play the role of black-hole 'mimickers', i.e. they are indistinguishable from the Schwarzschild solution at great distances, but could nonetheless lead to observable deviations from the latter, for instance in the orbits of massive particles and photons and in the gravitational-wave spectrum (see [13,15] and references therein). Last but not least, they could be very useful in solving the information puzzle arising during black-hole evaporation [18].…”

Section: Introductionmentioning

confidence: 99%

“…We can obtain them using general relativity (GR) with anisotropic fluids as sources, but the underlying microscopic physics is mostly unknown. This difficulty becomes particularly severe in those cases in which the deformations from the usual Schwarzschild solution have super-Planckian origin [13]. The consequence is that we have a huge degeneracy, giving rise to a broad class of metric solutions, which all describe nonsingular black holes with a dS core.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nonsingular black holes from conformal symmetries

Cadoni

Sanna

2023

Class. Quantum Grav.

Self Cite

View full text Add to dashboard Cite

We derive the form of the metric for static, nonsingular black holes with a de Sitter core, representing a deformation of the Schwarzschild solution, by assuming that the gravitational sources describe a flow between two conformal points, at small and great distances. The resulting black-hole metric turns out to be a particular case of the Fan & Wang metric, whose parameters have been recently constrained by using the data of the S2 star orbits around the galactic centre SgrA*.

show abstract

Section: Nonsingular Black Holes With a De Sitter Corementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nonsingular black holes from conformal symmetries

Cadoni

Sanna

2023

Class. Quantum Grav.

Self Cite

View full text Add to dashboard Cite

show abstract

Formation and evaporation of quantum black holes from the decoupling mechanism in quantum gravity

Borissova

Platania

2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We propose a new method to account for quantum-gravitational effects in cosmological and black hole spacetimes. At the core of our construction is the “decoupling mechanism”: when a physical infrared scale overcomes the effect of the regulator implementing the Wilsonian integration of fluctuating modes, the renormalization group flow of the scale-dependent effective action freezes out, so that at the decoupling scale the latter approximates the standard quantum effective action. Identifying the decoupling scale allows to access terms in the effective action that were not part of the original truncation and thus to study leading-order quantum corrections to field equations and their solutions. Starting from the Einstein-Hilbert truncation, we exploit for the first time the decoupling mechanism in quantum gravity to investigate the dynamics of quantum-corrected black holes from formation to evaporation. Our findings are in qualitative agreement with previous results in the context of renormalization group improved black holes, but additionally feature novel properties reminiscent of higher-derivative operators with specific non-local form factors.

show abstract

Evaporation and information puzzle for 2D nonsingular asymptotically flat black holes

Cadoni

Sanna

2023

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We investigate the thermodynamics and the classical and semiclassical dynamics of two-dimensional (2D), asymptotically flat, nonsingular dilatonic black holes. They are characterized by a de Sitter core, allowing for the smearing of the classical singularity, and by the presence of two horizons with a related extremal configuration. For concreteness, we focus on a 2D version of the Hayward black hole. We find a second order thermodynamic phase transition, separating large unstable black holes from stable configurations close to extremality. We first describe the black-hole evaporation process using a quasistatic approximation and we show that it ends in the extremal configuration in an infinite amount of time. We go beyond the quasistatic approximation by numerically integrating the field equations for 2D dilaton gravity coupled to N massless scalar fields, describing the radiation. We find that the inclusion of large backreaction effects (N ≫ 1) allows for an end-point extremal configuration after a finite evaporation time. Finally, we evaluate the entanglement entropy (EE) of the radiation in the quasistatic approximation and construct the relative Page curve. We find that the EE initially grows, reaches a maximum and then goes down towards zero, in agreement with previous results in the literature. Despite the breakdown of the semiclassical approximation prevents the description of the evaporation process near extremality, we have a clear indication that the end point of the evaporation is a regular, extremal state with vanishing EE of the radiation. This suggests that the nonunitary evolution, which commonly characterizes the evaporation of singular black holes, could be traced back to the presence of the singularity.

show abstract

Effective models of nonsingular quantum black holes

Cited by 20 publications

References 201 publications

Nonsingular black holes from conformal symmetries

Nonsingular black holes from conformal symmetries

Formation and evaporation of quantum black holes from the decoupling mechanism in quantum gravity

Evaporation and information puzzle for 2D nonsingular asymptotically flat black holes

Contact Info

Product

Resources

About