Quasinormal modes of Gauss-Bonnet-AdS black holes: towards holographic description of finite coupling

DOI10.1007/JHEP09(2017)139zbMATH Open1382.83088arXiv1705.07732MaRDI QIDQ1706013

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Publication date: 19 March 2018

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Abstract: Here we shall show that there is no other instability for the Einstein-Gauss-Bonnet-anti-de Sitter (AdS) black holes, than the eikonal one and consider the features of the quasinormal spectrum in the stability sector in detail. The obtained quasinormal spectrum consists from the two essentially different types of modes: perturbative and non-perturbative in the Gauss-Bonnet coupling $alpha$. The sound and hydrodynamic modes of the perturbative branch can be expressed through their Schwazrschild-AdS limits by adding a linear in $alpha$ correction to the damping rates: $omegaapproxRe(omeg{a}_{SAdS})-Im(omeg{a}_{SAdS})(1-alphacdot((D+1)(D-4)/2R^2))i$, where $R$ is the AdS radius. The non-perturbative branch of modes consists of purely imaginary modes, whose damping rates unboundedly increase when $alpha$ goes to zero. When the black hole radius is much larger than the anti-de Sitter radius $R$, the regime of the black hole with planar horizon (black brane) is reproduced. If the Gauss-Bonnet coupling $alpha$ (or used in holography $lambd{a}_{GB}$) is not small enough, then the black holes and branes suffer from the instability, so that the holographic interpretation of perturbation of such black holes becomes questionable, as, for example, the claimed viscosity bound violation in the higher derivative gravity. For example, $D=5$ black brane is unstable at $|lambd{a}_{GB}|>1/8$ and has anomalously large relaxation time when approaching the threshold of instability.

Full work available at URL: https://arxiv.org/abs/1705.07732

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