Hairy Black Hole Stability in AdS, Quantum Mechanics on the Half-Line and Holography

Abstract

We consider the linear stability of $4$-dimensional hairy black holes with mixed boundary conditions in Anti-de Sitter spacetime. We focus on the mass of scalar fields around the maximally supersymmetric vacuum of the gauged $\mathcal{N}=8$ supergravity in four dimensions, $m^2=-2l^{-2}$. It is shown that the Schrödinger operator on the half-line, governing the $S^2$, $H^2$ or ${\mathbb{R}}^2$ invariant mode around the hairy black hole, allows for non-trivial self-adjoint extensions and each of them correspons to a class of mixed boundary conditions in the gravitational theory. Discarding the self-adjoint extensions with a negative mode impose a restriction on these boundary conditions. The restriction is given in terms of an integral of the potential in the Schrödinger operator resembling the estimate of Simon for Schrödinger operators on the real line. In the context of AdS/CFT duality, our result has a natural interpretation in terms of the field theory dual effective potential.

13 pages, no figures, references added, matches published version

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• Holographic equation of state in fluid/gravity duality
• Instability of asymptotically anti de Sitter black holes under Robin conditions at the timelike boundary
• Einstein-Katz action, variational principle, Noether charges and the thermodynamics of AdS-black holes
• Termodinámica de agujeros negros y campos escalares
• Agujeros Negros con Pelo y Dualidad AdS/CFT