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Title: Charged black holes with axionic-type couplings: classes of solutions and dynamical scalarization
Author: Fernandes, Pedro G. S.
Herdeiro, Carlos A. R.
Pombo, Alexandre M.
Radu, Eugen
Sanchis-Gual, Nicolas
Keywords: Black holes
Issue Date: 21-Oct-2019
Publisher: American Physical Society
Abstract: We consider an augmented Einstein-Maxwell-scalar model including an axionic-type coupling between the scalar and electromagnetic field. We study dyonic black hole solutions in this model. For the canonical axionic coupling emerging from high energy physics, all charged black holes have axion hair. We present their domain of existence and investigate some physical properties. For other axionic-type couplings, two classes of black hole solutions may coexist in the model: scalar-free Reissner-Nordström black holes and scalarized black holes. We show that in some region of the parameter space the scalar-free solutions are unstable. Then, there is nonuniqueness since new scalarized black hole solutions with the same global charges, which are entropically preferred over the scalar-free solutions and, moreover, emerge dynamically from the instability of the former, also exist.
Peer review: yes
DOI: 10.1103/PhysRevD.100.084045
ISSN: 2470-0010
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