Conformally coupled scalar black holes admit a flat horizon due to axionic charge

Abstract : Static, charged black holes in the presence of a negative cosmological constant and with a planar horizon are found in four dimensions. The solutions have scalar secondary hair. We claim that these constitute the planar version of the Martinez-Troncoso-Zanelli black holes, only known up to now for a curved event horizon in four dimensions. Their planar version is rendered possible due to the presence of two, equal and homogeneously distributed, axionic charges dressing the flat horizon. The solutions are presented in the conformal and minimal frame and their basic properties and thermodynamics analysed. Entertaining recent applications to holographic superconductors, we expose two branches of solutions: the undressed axionic Reissner-Nordstrom-AdS black hole, and the novel black hole carrying secondary hair. We show that there is a critical temperature at which the (bald) axionic Reissner-Nordstrom-AdS black hole undergoes a second order phase transition to the hairy black hole spontaneously acquiring scalar hair.
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Journal of High Energy Physics, Springer, 2012, 1209 (008), pp.21
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Soumis le : mercredi 23 mai 2012 - 16:49:54
Dernière modification le : jeudi 7 février 2019 - 16:02:01

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  • HAL Id : hal-00700719, version 1
  • ARXIV : 1205.4025

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Yannis Bardoux, Marco M. Caldarelli, Christos Charmousis. Conformally coupled scalar black holes admit a flat horizon due to axionic charge. Journal of High Energy Physics, Springer, 2012, 1209 (008), pp.21. 〈hal-00700719〉

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