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Pearson cross-correlation in the first four black hole binary mergers

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arxiv 2008.12663 v3 pith:NCBPZZYX submitted 2020-08-28 gr-qc astro-ph.HE

Paolo Marcoccia , Felicia Fredriksson , Alex B. Nielsen , Germano Nardini This is my paper · ORCID
classification gr-qcastro-ph.HE
keywords ligodatacross-correlationcross-correlationspearsonannouncedblackcollaborations
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We adopt the Pearson cross-correlation measure to analyze the LIGO Hanford and LIGO Livingston detector data streams around the events GW150914, GW151012,GW151226 and GW170104. We find that the Pearson cross-correlation method is sensitive to these signals, with correlations peaking when the black hole binaries reconstructed by the LIGO Scientific and Virgo Collaborations, are merging. We compare the obtained cross-correlations with the statistical correlation fluctuations arising in simulated Gaussian noise data and in LIGO data at times when no event is claimed. Our results for the significance of the observed cross-correlations are broadly consistent with those announced by the LIGO Scientific and Virgo Collaborations based on matched-filter analysis. In the same data, if we subtract the maximum likelihood waveforms corresponding to the announced signals, no residual cross-correlations persists at a statistically significant level.

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  1. Ensemble-Based Residual Tests of GW231123 across Waveform Models

    gr-qc 2026-08 conditional novelty 6.0 of 10

    GW231123's residuals are consistent with detector noise for all five waveform models, and the strain-level differences between models are too small to be detected.

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