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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/113900
Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation
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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.
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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: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/113900