Stability of higher dimensional Reissner-Nordstrom-anti-de Sitter black holes

TL;DR

This paper demonstrates that higher-dimensional Reissner-Nordstrom-anti-de Sitter black holes are dynamically stable against gravitational perturbations across various dimensions, despite known thermodynamic instabilities.

Contribution

The study proves the dynamical stability of D-dimensional RN-AdS black holes for all charges and AdS radii, extending stability results to higher dimensions.

Findings

Black holes are stable for all charges and AdS radii in dimensions 5 to 11.

Dynamical stability does not contradict known scalar field instabilities.

Thermodynamic instability does not imply dynamical instability.

Abstract

We investigate stability of the D-dimensional Reissner-Nordstrom-anti-de-Sitter metrics as solutions of the Einstein-Maxwell equations. We have shown that asymptotically anti-de Sitter black holes are dynamically stable for all values of charge and anti-de Sitter radius in $D=5,6...11$ dimensional space-times. This does not contradict to dynamical instability of RN-AdS black holes found by Gubser in $\mathcal{N}=8$ gauged supergravity, because the latter instability comes from the tachyon mode of the scalar field, coupled to the system. Asymptotically AdS black holes are known to be thermodynamically unstable for some region of parameters, yet, as we have shown here, they are stable against gravitational perturbations.