Scalarization of asymptotically Anti-de Sitter black holes with applications to holographic phase transitions

Abstract

We study the spontaneous scalarization of spherically symmetric, static and asymptotically Anti-de Sitter (aAdS) black holes in a scalar-tensor gravity model with non-mininal coupling of the form ${\varphi }^2\left(\alpha \mathcal{R}+\gamma \mathcal{G}\right)$, where $\alpha$ and $\gamma$ are constants, while $\mathcal{R}$ and $\mathcal{G}$ are the Ricci scalar and Gauss-Bonnet term, respectively. Since these terms act as an effective ``mass'' for the scalar field, non-trivial values of the scalar field in the black hole space-time are possible for {\it a priori} vanishing scalar field mass. In particular, we demonstrate that the scalarization of an aAdS black hole requires the curvature invariant $-\left(\alpha \mathcal{R}+\gamma \mathcal{G}\right)$ to drop below the Breitenlohner-Freedman bound close to the black hole horizon, while it asymptotes to a value well above the bound. The dimension of the dual operator on the AdS boundary depends on the parameters $\alpha$ and $\gamma$ and we demonstrate that -- for fixed operator dimension -- the expectation value of this dual operator increases with decreasing temperature of the black hole, i.e. of the dual field theory. When taking backreaction of the space-time into account, we find that the scalarization of the black hole is the dual description of a phase transition in a strongly coupled quantum system, i.e. corresponds to a holographic phase transition. A possible application are liquid-gas quantum phase transitions, e.g. in ${}^4$He. Finally, we demonstrate that extremal black holes with $Ad{S}_2\times S^2$ near-horizon geometry {\it cannot support regular scalar fields on the horizon} in the scalar-tensor model studied here.

arXiv commentv2: discussion on Fefferman-Graham construction added; discussion on applications to condensed matter systems added; matches version accepted for publication in Phys. Rev.D

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