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…
Abbottet al., Observation of Gravitational Waves from a Binary Black Hole Merger, Phys
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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…