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arXiv · 2609.07167

The (in)stability on total transmission modes with small bumps

Xi-Ning Dong·Liang-Bi Wu·Yu-Sen Zhou·Zong-Kuan Guo
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Abstract

Total transmission modes (TTMs) are a class of reflectionless solutions to black hole perturbation equations, closely related to quasinormal modes (QNMs), and can exhibit significant sensitivity to weak environmental perturbations. In this work, we investigate the spectrum (in)stability of TTMs of Tangherlini black holes by introducing a localized P\"{o}schl-Teller bump perturbation into the effective potential, and employ a modified Chebyshev-Lobatto grid to improve the numerical accuracy of the localized perturbation. For $d=14$, $\ell=2$, and $s=2$, the purely imaginary TTM exhibits relatively strong spectrum stability, whereas the genuine complex TTMs undergo significant migrations even for small perturbations, consistent with the spectrum stability revealed by previous pseudospectrum analyses.

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Xi-Ning Dong, Liang-Bi Wu, Yu-Sen Zhou, Zong-Kuan Guo. 2026-09-07. The (in)stability on total transmission modes with small bumps. https://arxiv.org/abs/2609.07167

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