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arXiv · 2606.15785

Quasinormal modes and excitation factors of a regular black hole with zero-point length

Milena Skvortsova
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Abstract

We study the ringdown of the regular Jusufi-Singleton black hole, whose nonsingular core is controlled by a zero-point length arising from a non-local, T-duality-inspired gravitational model. Scalar, electromagnetic and Dirac perturbations are considered. The zero-point-length parameter raises the effective scattering barrier and produces a systematic increase of the oscillation frequencies, while also making the damping faster over most of the parameter range. High-order WKB results are checked against time-domain integration and show very good agreement for the dominant modes. We also compute excitation factors, which characterize the source-independent strength of the quasinormal-mode poles and show a smooth dependence on the new length scale.

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Milena Skvortsova. 2026-06-14. Quasinormal modes and excitation factors of a regular black hole with zero-point length. https://arxiv.org/abs/2606.15785

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