Formation and evaporation of an electrically charged black hole in conformal gravity

Bambi, Cosimo; Modesto, Leonardo; Porey, Shiladitya; Rachwał, Lesław

doi:10.1140/epjc/s10052-018-5608-4

Cited by 31 publications

(38 citation statements)

References 52 publications

(89 reference statements)

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“…The features of the obtained regular belt are similar to those heuristically described in [1] and obtained for noncommutative inspired regular RBH in [28] [29]. However, they differ from the features found for the exact regular RBH solutions in the framework of conformal quantum gravity [30], where the spacetime is inextendible beyond "r = 0" and the curvature invariants are continuous.…”

Section: Discussionsupporting

confidence: 78%

Non-singular quantum improved rotating black holes and their maximal extension

Torres¹

2017

Gen Relativ Gravit

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We add a prescription to the Newman-Janis algorithm in order to use it as a means of finding new extended ('through r < 0') rotating black hole spacetimes from static spherically symmetric ones. Then, we apply the procedure to a quantum improved black hole spacetime coming from Quantum Einstein Gravity. The goal is to get a maximally extended spacetime corresponding to a non-singular rotating black hole emulating the standard maximally extended Kerr black hole in regions where quantum effects are negligible. We rigourously check for the existence of scalar curvature singularities in the quantum improved rotating spacetime and we show that it is devoid of them. We also analyze the horizons and causal structure of the rotating black hole and provide Penrose diagrams for the maximally extended spacetime.

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Section: Discussionsupporting

confidence: 78%

Non-singular quantum improved rotating black holes and their maximal extension

Torres¹

2017

Gen Relativ Gravit

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“…To see this, we start 19 We can see that this definition is consistent with the concept of J, as follows. To do that, we first note that (14) suggests u i as the natural time for description of the evaporation of each shell, and that in the continuum limit the redshift factor between U and u i is e A 2 , as (25) shows.…”

Section: Insensitivity To the Detail Of The Initial Wave Functionmentioning

confidence: 81%

“…5 See also [13][14][15][16][17]. See, e.g., [18,19] for a black hole as a closed trapped region in the vacuum. In order to prove this idea, we have to analyze the dynamics of the coupled quantum system of matter and gravity.…”

Section: A(u)mentioning

confidence: 99%

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A Model of Black Hole Evaporation and 4D Weyl Anomaly

Kawai

Yokokura

2017

Universe

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Abstract:We analyze the time evolution of a spherically-symmetric collapsing matter from the point of view that black holes evaporate by nature. We consider conformal matters and solve the semi-classical Einstein equation G µν = 8πG T µν by using the four-dimensional Weyl anomaly with a large c coefficient. Here, T µν contains the contribution from both the collapsing matter and Hawking radiation. The solution indicates that the collapsing matter forms a dense object and evaporates without horizon or singularity, and it has a surface, but looks like an ordinary black hole from the outside. Any object we recognize as a black hole should be such an object.

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“…In Ref. [7], we found a singularity-free rotating black hole solution conformally equivalent to the Kerr metric (see Ref. [8] on how conformal invariance is preserved at the quantum level).…”

Section: Introductionmentioning

confidence: 99%

Testing conformal gravity with astrophysical black holes

2017

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Weyl conformal symmetry can solve the problem the spacetime singularities present in Einstein's gravity. In a recent paper, two of us have found a singularity-free rotating black hole solution in conformal gravity. In addition to the mass M and the spin angular momentum J of the black hole, the new solution has a new parameter, L, which here we consider to be proportional to the black hole mass. Since the solution is conformally equivalent to the Kerr metric, photon trajectories are unchanged, while the structure of an accretion disk around a black hole is affected by the value of the parameter L. In this paper, we show that X-ray data of astrophysical black holes require L/M < 1.2.

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Formation and evaporation of an electrically charged black hole in conformal gravity

Cited by 31 publications

References 52 publications

Non-singular quantum improved rotating black holes and their maximal extension

Non-singular quantum improved rotating black holes and their maximal extension

A Model of Black Hole Evaporation and 4D Weyl Anomaly

Testing conformal gravity with astrophysical black holes

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