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Aniceto, P., Pani, P. & Rocha, J. V. (2016). Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation. Journal of High Energy Physics.
A. P. et al., "Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation", in Journal of High Energy Physics, 2016
@article{p.2016_1734954229732, author = "Aniceto, P. and Pani, P. and Rocha, J. V.", title = "Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation", journal = "Journal of High Energy Physics", year = "2016", volume = "", number = "", doi = "10.1007/JHEP05(2016)115" }
TY - JOUR TI - Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation T2 - Journal of High Energy Physics AU - Aniceto, P. AU - Pani, P. AU - Rocha, J. V. PY - 2016 SN - 1126-6708 DO - 10.1007/JHEP05(2016)115 AB - 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. ER -