paper

Quasinormal modes of a scale-dependent black hole in 5D spacetime with cosmological constant

arXiv:2611.11584 · doi:10.1140/epjp/s13360-026-08418-6

Abstract

In this paper, we investigate the quasinormal modes (QNMs) of a scale-dependent black hole in five dimensions with a positive cosmological constant, considering i) scalar, ii) electromagnetic, and iii) Dirac perturbations. After deriving exact analytical solutions within the framework of scale-dependent gravity in five dimensions and selecting a different family of solutions (cf. \cite{Contreras:2019fwu}), we analyze the corresponding effective potentials (given by the lapse function) for each perturbation type. We employ a first-order approximation for the lapse function, as it closely matches the exact case for small . Since quantum corrections are expected to be small, our focus is on a relatively low range of the scale-dependent parameter . We confirm that the WKB semi-analytical approach can be used to compute the QNMs for these perturbations to the background geometry. We calculate the QNM frequencies for the classical case (for comparison) and for cases where the scale-dependent parameter , which quantifies deviations from General Relativity, is non-zero. The results are summarized in a series of tables and figures. Finally, we find that, regardless of the perturbation type, the solutions are stable, as the imaginary part of each QNM frequency is negative.

arXiv comment39 pages, 11 figures, 4 tables. Published in The European Physical Journal Plus

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