A new basis-invariant excitation factor for coupled black hole perturbation systems shows resonant amplification at avoided crossings between fundamental modes of different fields in the Einstein-Maxwell-axion theory.
Although QNMs are difficult to treat analytically, their features can be captured by the following simple model
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Resonance of black hole quasinormal modes in coupled systems
A new basis-invariant excitation factor for coupled black hole perturbation systems shows resonant amplification at avoided crossings between fundamental modes of different fields in the Einstein-Maxwell-axion theory.