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Pole skipping, avoided crossing, and resonant excitation in Kerr quasinormal modes near algebraically special frequencies

Kei-ichiro Kubota1 and Hayato Motohashi2,3

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Phys. Rev. D 114, L081502 – Published 28 October, 2026

DOI: https://doi.org/10.1103/29n2-dsmr

Abstract

Kerr quasinormal modes near algebraically special frequencies exhibit anomalous behavior, including apparent bifurcation, disappearance, and a nonsmooth connection to the Schwarzschild limit, which has remained puzzling for decades. Tracking poles and zeros of Green-function building blocks across different Riemann sheets, we show that the bifurcation is due to an avoided crossing accompanied by resonant excitation, while the disappearance is due to pole skipping caused by cancellation of a quasinormal-mode pole by a Matsubara-mode zero. This resolves the physical origin of these long-standing anomalies.

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Phys. Rev. D 114, L081502– Published 28 October, 2026
  • Received 25 May 2026
  • Accepted 2 September 2026
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