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2016-05-19

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cc-by (c) Aniceto, Pedro et al., 2016
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/113900

Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation

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Recurs relacionat

https://doi.org/10.1007/JHEP05(2016)115

Resum

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.

Matèries

Forats negres (Astronomia), Espai i temps

Matèries (anglès)

Black holes (Astronomy), Space and time

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Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

ANICETO, Pedro, PANI, Paolo and ROCHA, Jorge V. Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation. Journal of High Energy Physics. 2016. Vol. 2016, num. 115. ISSN 1126-6708. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/113900

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