In the eikonal regime, grey-body factors of spherically symmetric black holes can be expressed directly via the fundamental quasinormal mode, with overtones entering as corrections at lower frequencies.
Greybody factors imprinted on black ho le ringdowns: An alternative to superposed quasinormal modes
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Correspondence between grey-body factors and quasinormal modes
In the eikonal regime, grey-body factors of spherically symmetric black holes can be expressed directly via the fundamental quasinormal mode, with overtones entering as corrections at lower frequencies.