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Aniceto, P. & Rocha, J. V. (2017). Dynamical black holes in low-energy string theory. Journal of High Energy Physics.
A. P. and J. M. Rocha, "Dynamical black holes in low-energy string theory", in Journal of High Energy Physics, 2017
@article{p.2017_1734954266933, author = "Aniceto, P. and Rocha, J. V.", title = "Dynamical black holes in low-energy string theory", journal = "Journal of High Energy Physics", year = "2017", volume = "", number = "", doi = "10.1007/JHEP05(2017)035", url = "http://www.scopus.com/inward/record.url?eid=2-s2.0-85019073085&partnerID=MN8TOARS" }
TY - JOUR TI - Dynamical black holes in low-energy string theory T2 - Journal of High Energy Physics AU - Aniceto, P. AU - Rocha, J. V. PY - 2017 SN - 1126-6708 DO - 10.1007/JHEP05(2017)035 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85019073085&partnerID=MN8TOARS AB - We investigate time-dependent spherically symmetric solutions of the four-dimensional Einstein-Maxwell-axion-dilaton system, with the dilaton coupling that occurs in low-energy effective heterotic string theory. A class of dilaton-electrovacuum radiating solutions with a trivial axion, previously found by Guven and Yoruk, is re-derived in a simpler manner and its causal structure is clarified. It is shown that such dynamical spacetimes featuring apparent horizons do not possess a regular light-like past null infinity or future null infinity, depending on whether they are radiating or accreting. These solutions are then extended in two ways. First we consider a Vaidya-like generalisation, which introduces a null dust source. Such spacetimes are used to test the status of cosmic censorship in the context of low-energy string theory. We prove that — within this family of solutions — regular black holes cannot evolve into naked singularities by accreting null dust, unless standard energy conditions are violated. Secondly, we employ S-duality to derive new time-dependent dyon solutions with a nontrivial axion turned on. Although they share the same causal structure as their Einstein-Maxwell-dilaton counterparts, these solutions possess both electric and magnetic charges. ER -