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.
In particular, we present results only for l = 2, as it is the smallest l where all the degrees of freedom are coupled and is also considered observationally important
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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.