Abstract
Einstein-Maxwell-dilaton theory with non-trivial dilaton potential is known to admit asymptotically flat and (Anti-)de Sitter charged black hole solutions. We investigate the conditions for the presence of horizons as function of the parameters mass M, charge Q and dilaton coupling strength α. We observe that there is a value of α which separate two regions, one where the black hole is Reissner-Nordström-like from a region where it is Schwarzschild-like. We find that for de Sitter and small non-vanishing α, the extremal case is not reached by the solution. We also discuss the attractive or repulsive nature of the leading long distance interaction between two such black holes, or a test particle and one black hole, from a world-line effective field theory point of view. Finally, we discuss possible modifications of the Weak Gravity Conjecture in the presence of both a dilatonic coupling and a cosmological constant.
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Benakli, K., Branchina, C. & Lafforgue-Marmet, G. Dilatonic (Anti-)de Sitter black holes and Weak Gravity Conjecture. J. High Energ. Phys. 2021, 58 (2021). https://doi.org/10.1007/JHEP11(2021)058
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DOI: https://doi.org/10.1007/JHEP11(2021)058