Hunting for fermionic instabilities in charged AdS black holes
arXiv:1910.04181 · doi:10.1007/JHEP04(2020)196
Abstract
Fermions scattering on a black hole background cannot develop an instability sourced by superradiance. However, in a global (or planar) AdS-Reissner-Nordström background fermions can violate the AdS fermionic mass stability bound as measured by a near horizon observer at zero temperature. This suggests that AdS-Reissner-Nordström black holes might still be unstable to Dirac perturbations. Motivated by this observation we search for linear mode instabilities of Dirac fields in these backgrounds but find none. This is in contrast with the scalar field case, where a violation of the near-horizon Breitenlöhner-Freedman stability bound in the AdS-Reissner-Nordström background triggers the already known scalar condensation near-horizon linear instability (in the planar limit this is Gubser's instability that initiated the holographic superconductor programme). We consider both the standard and alternative AdS/CFT quantizations (that preserve the conformal invariance of AdS). These are reflective boundary conditions that have vanishing energy flux at the asymptotic boundary.
arXiv comment55 pages, 12 figures. v2: improvements in some discussions made and subsection moved to appendix. Matches published version
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