Echo modes from small metric bumps approach the real frequency axis with decreasing spacing and eventually take over the fundamental quasinormal mode, a transition aligned with the appearance of echo pulses in the ringdown waveform and consistent with causality when the infinite Green's function…
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Evolution of black hole echo modes and the causality dilemma
Echo modes from small metric bumps approach the real frequency axis with decreasing spacing and eventually take over the fundamental quasinormal mode, a transition aligned with the appearance of echo pulses in the ringdown waveform and consistent with causality when the infinite Green's function…