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http://hdl.handle.net/2445/113900
Title: | Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation |
Author: | Aniceto, Pedro Pani, Paolo Rocha, Jorge V. |
Keywords: | Forats negres (Astronomia) Espai i temps Black holes (Astronomy) Space and time |
Issue Date: | 19-May-2016 |
Publisher: | Springer Verlag |
Abstract: | We construct exact, time-dependent, black hole solutions of Einstein-Maxwell-dilaton theory with arbitrary dilaton coupling, a. For a = 1 this theory arises as the four-dimensional low-energy effective description of heterotic string theory. These solutions represent electrically charged, spherically symmetric black holes emitting or absorbing charged null fluids and generalize the Vaidya and Bonnor-Vaidya solutions of general relativity and of Einstein-Maxwell theory, respectively. The a = 1 case stands out as special, in the sense that it is the only choice of the coupling that allows for a time-dependent dilaton field in this class of solutions. As a by-product, when a = 1 we show that an electrically charged black hole in this theory can be overcharged by bombarding it with a stream of electrically charged null fluid, resulting in the formation of a naked singularity. This provides an example of cosmic censorship violation in an exact dynamical solution to low-energy effective string theory and in a case in which the total stress-energy tensor satisfies all energy conditions. When a ≠ 1, our solutions necessarily have a time-independent scalar field and consequently cannot be overcharged. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP05(2016)115 |
It is part of: | Journal of High Energy Physics, 2016, vol. 2016, num. 115 |
URI: | http://hdl.handle.net/2445/113900 |
Related resource: | https://doi.org/10.1007/JHEP05(2016)115 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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