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• W3100617063 abstract "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." @default.
• W3100617063 created "2020-11-23" @default.
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• W3100617063 creator A5071638989 @default.
• W3100617063 date "2017-05-01" @default.
• W3100617063 modified "2023-09-23" @default.
• W3100617063 title "Dynamical black holes in low-energy string theory" @default.
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• W3100617063 doi "https://doi.org/10.1007/jhep05(2017)035" @default.
• W3100617063 hasPublicationYear "2017" @default.
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