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Black hole ringdown echoes and howls
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abstract
Recently the possibility of detecting echoes of ringdown gravitational waves from binary black hole mergers was shown. The presence of echoes is expected if the black hole is surrounded by a mirror that reflects gravitational waves near the horizon. Here, we present slightly more sophisticated templates motivated by a waveform which is obtained by solving the linear perturbation equation around a Kerr black hole with a complete reflecting boundary condition in the stationary traveling wave approximation. We estimate that the proposed template can bring about $10\%$ improvement in the signal-to-noise ratio.
Forward citations
Cited by 2 Pith papers
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Model-agnostic search of gravitational wave echoes in LVK data
A multi-detector phase-marginalized echo search finds no statistically significant long-lived quasinormal-mode echoes in GW150914, GW231226, and GW250114, and sets 90% upper limits on their network SNR and amplitude.
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Stretched Horizon Dissipation and the Fate of Echoes
A microscopic estimate shows infalling modes with frequency near the Hawking temperature suffer only moderate dissipation before reaching a stretched horizon, so gravitational wave echoes could survive.
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