Black holes with $\mathfrak{su}(N)$ gauge field hair and superconducting horizons

Abstract

We present new planar dyonic black hole solutions of the $\mathfrak{su}(N)$ Einstein-Yang-Mills equations in asymptotically anti-de Sitter space-time, focussing on $\mathfrak{su}(2)$ and $\mathfrak{su}(3)$ gauge groups. The magnetic part of the gauge field forms a condensate close to the planar event horizon. We compare the free energy of a non-Abelian hairy black hole with that of an embedded Reissner-Nordström-anti-de Sitter (RN-AdS) black hole having the same Hawking temperature and electric charge. We find that the hairy black holes have lower free energy. We present evidence that there is a phase transition at a critical temperature, above which the only solutions are embedded RN-AdS black holes. At the critical temperature, an RN-AdS black hole can decay into a hairy black hole, and it is thermodynamically favourable to do so. Working in the probe limit, we compute the frequency-dependent conductivity, and find that enlarging the gauge group from $\mathfrak{su}(2)$ to $\mathfrak{su}(3)$ eliminates a divergence in the conductivity at nonzero frequency.

47 pages, 13 figures, minor changes, accepted for publication in JHEP

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Cited by in corpus (2)

• Analytic non-Abelian gravitating solitons in the Einstein-Yang-Mills-Higgs theory and transitions between them
• Non-Abelian black holes in conformal gravity