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Reanalyzing the ringdown signal of GW150914 using the F-statistic method
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The ringdown phase of a gravitational wave (GW) signal from a binary black hole merger provides valuable insights into the properties of the final black hole and serves as a critical test of general relativity in the strong-field regime. A key aspect of this investigation is to determine whether the first overtone mode exists in real GW data, as its presence would offer significant implications for our understanding of general relativity under extreme conditions. To address this, we conducted a reanalysis of the ringdown signal from GW150914, using the newly proposed F-statistic method to search for the first overtone mode. Our results are consistent with those obtained through classical time-domain Bayesian inference, indicating that there is no evidence of the first overtone mode in the ringdown signal of GW150914. However, our results show the potentiality of utilizing the F-statistic methodology to unearth nuanced features within GW signals, thereby contributing novel insights into black hole properties.
Forward citations
Cited by 4 Pith papers
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First Overtone Mode in the Ringdown Signal of GW231028
The ringdown of GW231028 contains evidence for the 221 first overtone mode alongside the dominant 220 mode, with a Bayes factor of 193 at 10M after the peak.
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Detection of a Higher Harmonic Quasi-normal Mode in the Ringdown Signal of GW231123
The ringdown of GW231123 contains a detectable 200 quasinormal mode in addition to the fundamental 220 mode, with log10 Bayes factor 5.3, and the inferred remnant mass and spin agree with general relativity.
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Statistical identification of ringdown modes with rational filters
A frequentist false-alarm framework for rational-filter ringdown analysis is validated on numerical relativity waveforms and shows only marginal evidence for the 221 overtone in GW150914.
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Revisiting GW150914 with a non-planar, eccentric waveform model
Using a waveform model that includes both eccentricity and spin precession, the authors confirm GW150914 was a quasi-circular, slowly spinning black hole merger, with eccentricity below 0.08 at 15 Hz.
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