Pseudospectra of Holographic Quasinormal Modes
arXiv:2307.08751 · doi:10.1007/JHEP12(2023)187
Abstract
Quasinormal modes and frequencies are the eigenvectors and eigenvalues of a non-Hermitian differential operator. They hold crucial significance in the physics of black holes. The analysis of quasinormal modes of black holes in asymptotically Anti-de Sitter geometries plays also a key role in the study of strongly coupled quantum many-body systems via gauge/gravity duality. In contrast to normal Sturm-Liouville operators, the eigenvalues of non-Hermitian (and non-normal) operators generally exhibit instability under small perturbations. This research focuses on the stability analysis of quasinormal frequencies pertaining to asymptotically planar AdS black holes, employing pseudospectrum analysis. Specifically, we concentrate on the pseudospectra of scalar and transverse gauge fields, shedding light on their relevance within the framework of gauge/gravity duality.
v1: 59 pages, 19 figures. v2: added appendix D with QNF numerical values, and new references. v3: added section 3.3, minor modifications elsewhere and new references; published version. v4: typos corrected
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