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Title: Einstein-Maxwell-scalar black holes: classes of solutions, dyons and extremality
Author: Astefanesei, D.
Herdeiro, C.
Pombo, A.
Radu, E.
Keywords: Black holes
Classical theories of gravity
Issue Date: 7-Oct-2019
Publisher: Springer Verlag
Abstract: Spherical black hole (BH) solutions in Einstein-Maxwell-scalar (EMS) models wherein the scalar field is non-minimally coupled to the Maxwell invariant by some coupling function are discussed. We suggest a classification for these models into two classes, based on the properties of the coupling function, which, in particular, allow, or not, the ReissnerNordstr¨om (RN) BH solution of electrovacuum to solve a given model. Then, a comparative analysis of two illustrative families of solutions, one belonging to each class is performed: dilatonic versus scalarised BHs. By including magnetic charge, that is considering dyons, we show that scalarised BHs can have a smooth extremal limit, unlike purely electric or magnetic solutions. In particular, we study this extremal limit using the entropy function formalism, which provides insight on why both charges are necessary for extremal solutions to exist.
Peer review: yes
DOI: 10.1007/JHEP10(2019)078
ISSN: 1126-6708
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