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Addressing the challenges of detecting time-overlapping compact binary coalescences

Relton, Philip, Virtuoso, Andrea, Bini, Sophie, Raymond, Vivien ORCID:, Harry, Ian, Drago, Marco, Lazzaro, Claudia, Miani, Andrea and Tiwari, Shubhanshu 2022. Addressing the challenges of detecting time-overlapping compact binary coalescences. Physical Review D 106 (10) , 104045. 10.1103/PhysRevD.106.104045

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Standard detection and analysis techniques for transient gravitational waves make the assumption that detector data contains, at most, one signal at any time. As detectors improve in sensitivity, this assumption will no longer be valid. In this paper we examine how current search techniques for transient gravitational waves will behave under the presence of more than one signal. We perform searches on simulated data sets containing time-overlapping compact binary coalescences. This includes a modeled matched filter search (pycbc) and an unmodeled coherent search, coherent WaveBurst (cwb). Both of these searches are used by the LIGO-Virgo-KAGRA collaboration [1]. We find that both searches are capable of identifying both signals correctly when the signals are dissimilar in merger time, | Δ t c | ≥ 1     s , with pycbc missing only 1% of the overlapping binary black hole mergers it was provided. Both pipelines can find signal pairings within the region | Δ t c | < 1     s . However, clustering routines in the pipelines will cause only one of the two signals to be recovered, as such, the efficiency is reduced. Within this region, we find that cwb can identify both signals. We also find that matched filter searches can be modified to provide estimates of the correct parameters for each signal.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 1550-7998
Date of First Compliant Deposit: 15 February 2023
Date of Acceptance: 10 October 2022
Last Modified: 03 May 2023 08:37

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