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Tests of general relativity in the nonlinear regime: a parametrized plunge-merger-ringdown waveform model
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Tests of general relativity in the nonlinear regime: a parametrized plunge-merger-ringdown waveform model
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Gravitational waves provide a unique opportunity to test gravity in the dynamical and nonlinear regime. We present a parametrized test of general relativity (GR) that introduces generic deviations to the plunge, merger and ringdown stages of binary-black-hole coalescences. The novel feature of the model is that it can capture signatures of beyond-GR physics in the plunge-merger phase. We use the model to provide constraints on the plunge-merger parameters from the analysis of GW150914. Alarmingly, we find that GW200129 shows a strong violation of GR. We interpret this result as a false violation of GR either due to waveform systematics (mismodeling of spin precession) or data-quality issues.
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Cited by 1 Pith paper
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Precision Ringdown Measurements of Binary Black Hole Remnants
A ringdown analysis of 16 GWTC-3 binary black holes using cWB-reconstructed signals finds the dominant (2,2,0) mode consistent with GR: δf220 = 0.003±0.028 and δτ220 = 0.050^{+0.081}_{-0.086} (90% CI).
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