Resonant Excitation of Quasinormal Modes of Black Holes

TL;DR

This paper reveals a universal resonant excitation phenomenon between black hole quasinormal modes near an avoided crossing, offering new insights into black hole physics and potential avenues for exploring gravity.

Contribution

It introduces a novel understanding of resonant excitation of QNMs at avoided crossings using non-Hermitian physics, advancing black hole characterization methods.

Findings

Identification of resonant excitation near avoided crossings

Application of non-Hermitian physics to black hole QNMs

Potential for new gravitational physics exploration

Abstract

We elucidate that a distinctive resonant excitation between quasinormal modes (QNMs) of black holes emerges as a universal phenomenon at an avoided crossing near the exceptional point through high-precision numerical analysis and theory of QNMs based on the framework of non-Hermitian physics. This resonant phenomenon not only allows us to decipher a long-standing mystery concerning the peculiar behaviors of QNMs but also stands as a novel beacon for characterizing black hole spacetime geometry. Our findings pave the way for rigorous examinations of black holes and the exploration of new physics in gravity.