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Universe 2016, 2(2), 7; doi:10.3390/universe2020007

Where Does the Physics of Extreme Gravitational Collapse Reside?

1
Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía, 18008 Granada, Spain
2
Departamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, Spain
3
Instituto de Estructura de la Materia (IEM-CSIC), Serrano 121, 28006 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Gonzalo J. Olmo
Received: 20 October 2015 / Revised: 28 April 2016 / Accepted: 3 May 2016 / Published: 13 May 2016
(This article belongs to the Collection Open Questions in Black Hole Physics)
View Full-Text   |   Download PDF [828 KB, uploaded 13 May 2016]   |  

Abstract

The gravitational collapse of massive stars serves to manifest the most severe deviations of general relativity with respect to Newtonian gravity: the formation of horizons and spacetime singularities. Both features have proven to be catalysts of deep physical developments, especially when combined with the principles of quantum mechanics. Nonetheless, it is seldom remarked that it is hardly possible to combine all these developments into a unified theoretical model, while maintaining reasonable prospects for the independent experimental corroboration of its different parts. In this paper we review the current theoretical understanding of the physics of gravitational collapse in order to highlight this tension, stating the position that the standard view on evaporating black holes stands for. This serves as the motivation for the discussion of a recent proposal that offers the opposite perspective, represented by a set of geometries that regularize the classical singular behavior and present modifications of the near-horizon Schwarzschild geometry as the result of the propagation of non-perturbative ultraviolet effects originated in regions of high curvature. We present an extensive exploration of the necessary steps on the explicit construction of these geometries, and discuss how this proposal could change our present understanding of astrophysical black holes and even offer the possibility of detecting genuine ultraviolet effects in gravitational-wave experiments. View Full-Text
Keywords: black holes; white holes; gravitational collapse; Hawking evaporation; massive stars; quantum gravity black holes; white holes; gravitational collapse; Hawking evaporation; massive stars; quantum gravity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Barceló, C.; Carballo-Rubio, R.; Garay, L.J. Where Does the Physics of Extreme Gravitational Collapse Reside? Universe 2016, 2, 7.

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