Einstein-Maxwell-scalar black holes: classes of solutions, dyons and extremality

DUMITRU ASTEFANESEI, C. Herdeiro, A. Pombo, E. Radu

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

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 Reissner- Nordström (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.

Original languageEnglish
Article number78
JournalJournal of High Energy Physics
Volume2019
Issue number10
DOIs
StatePublished - 1 Oct 2019
Externally publishedYes

Keywords

  • Black Holes
  • Classical Theories of Gravity

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