A quantum improvement to the gravitational collapse of radiating stars

Fayos, Francesc; Torres, R. E. Ticse

doi:10.1088/0264-9381/28/10/105004

Cited by 20 publications

(26 citation statements)

References 42 publications

(101 reference statements)

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“…Nowadays, the event horizon is considered by many as an inappropriate concept for physical black holes, as its experimental verification takes an infinitely long time. In fact, even the necessity of apparent horizon for black holes has been questioned [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In this paper, we will refer to back-hole-like objects simply as black holes.…”

Section: Introductionmentioning

confidence: 99%

Static black hole and vacuum energy: thin shell and incompressible fluid

Matsuo

2018

J. High Energ. Phys.

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With the back reaction of the vacuum energy-momentum tensor consistently taken into account, we study static spherically symmetric black-hole-like solutions to the semi-classical Einstein equation. The vacuum energy is assumed to be given by that of 2-dimensional massless scalar fields, as a widely used model in the literature for black holes. The solutions have no horizon. Instead, there is a local minimum in the radius. We consider thin shells as well as incompressible fluid as the matter content of the black-holelike geometry. The geometry has several interesting features due to the back reaction of vacuum energy. In particular, Buchdahl's inequality can be violated without divergence in pressure, even if the surface is below the Schwarzschild radius. At the same time, the surface of the star can not be far below the Schwarzschild radius for a density not much higher than the Planck scale, and the proper distance from its surface to the origin can be very short even for very large Schwarzschild radius. The results also imply that, contrary to the folklore, in principle the Boulware vacuum can be physical for black holes.

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Section: Introductionmentioning

confidence: 99%

Static black hole and vacuum energy: thin shell and incompressible fluid

Matsuo

2018

J. High Energ. Phys.

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“…A Penrose diagram of the improved black hole for this case has been depicted in figure 2. Note that the usual R = 0 singularity in the classical Schwarzschild solution does not exist in the improved solution [3] [15]. It is also important to remark for later purposes that, from a classical point of view and as can be directly checked from fig.2, a photon in region II that follows the ingoing direction towards region III must reach R = 0.…”

Section: Improved Schwarzschild Solutionmentioning

confidence: 90%

On the interior of (quantum) black holes

Torres

2013

Physics Letters B

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Published in Physics letters B by ELSEVIER. The original publication is available at http://www.sciencedirect.com/science/article/pii/S0370269313005066Different approaches to quantum gravity conclude that black holes may possess an\ud inner horizon, in addition to the (quantum corrected) outer ‘Schwarzschild’ horizon.\ud In this paper we assume the existence of this inner horizon and explain the physical\ud process that might lead to the tunneling of particles through it. It is shown that the\ud tunneling would produce a flux of particles with a spectrum that deviates from the pure\ud thermal one. Under the appropriate approximation the extremely high temperature of\ud this horizon is calculated for an improved quantum black hole. It is argued that the\ud flux of particles tunneled through the horizons affects the dynamics of the black hole\ud interior leading to an endogenous instability.Preprin

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“…Proceeding in a similar way in a gravitational context, it has been a common strategy to retain the dependence of some of the couplings, G k and k say, on the RG scale k and identify the latter with a geometrical quantity or momentum. Based on such RG improvement ideas there is a substantial body of work investigating black-hole physics [341][342][343][344][345][346][347][348][349][350][351][352][353][354][355], gravitational collapse [356][357][358][359][360][361][362], and cosmological scenarios [320,360,[363][364][365][366][367][368][369][370][371][372][373][374][375][376] inspired by Asymptotic Safety. One might expect that this procedure could be justified in some cases where the external scale in question acts as an IR cutoff for fluctuations.…”

Section: Rg Improvementmentioning

confidence: 99%

Critical Reflections on Asymptotically Safe Gravity

et al. 2020

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Asymptotic safety is a theoretical proposal for the ultraviolet completion of quantum field theories, in particular for quantum gravity. Significant progress on this program has led to a first characterization of the Reuter fixed point. Further advancement in our understanding of the nature of quantum spacetime requires addressing a number of open questions and challenges. Here, we aim at providing a critical reflection on the state of the art in the asymptotic safety program, specifying and elaborating on open questions of both technical and conceptual nature. We also point out systematic pathways, in various stages of practical implementation, toward answering them. Finally, we also take the opportunity to clarify some common misunderstandings regarding the program.

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A quantum improvement to the gravitational collapse of radiating stars

Cited by 20 publications

References 42 publications

Static black hole and vacuum energy: thin shell and incompressible fluid

Static black hole and vacuum energy: thin shell and incompressible fluid

On the interior of (quantum) black holes

Critical Reflections on Asymptotically Safe Gravity

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