Pizzati, Elia, Sachdev, Surabhi, Gupta, Anuradha and Sathyaprakash, B. S. ![]() ![]() |
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Abstract
Merger rates of binary black holes, binary neutron stars, and neutron-star–black-hole binaries in the local Universe (i.e., redshift z = 0 ), inferred from the Laser Interferometer Gravitational Wave Observatory and Virgo, are 16 − 130 Gpc − 3 yr − 1 , 13 − 1900 Gpc − 3 yr − 1 , and 7.4 − 320 Gpc − 3 yr − 1 , respectively. These rates suggest that there is a significant chance that two or more of these signals will overlap with each other during their lifetime in the sensitivity band of future gravitational-wave detectors such as the Cosmic Explorer and Einstein Telescope. The detection pipelines provide the coalescence time of each signal with an accuracy O ( 10 ms ) . We show that by using a prior on the coalescence time from a detection pipeline, it is possible to correctly infer the properties of these overlapping signals with the current data-analysis infrastructure. We study different configurations of two overlapping signals created by nonspinning binaries, varying their time and phase at coalescence, as well as their signal-to-noise ratios. We conclude that, for the scenarios considered in this work, parameter inference is robust provided that their coalescence times in the detector frame are more than ∼ 1 – 2 s . Signals whose coalescence epochs lie within ∼ 0.5 s of each other suffer from significant biases in parameter inference, and new strategies and algorithms would be required to overcome such biases.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Physics and Astronomy |
Publisher: | American Physical Society |
ISSN: | 2470-0010 |
Date of First Compliant Deposit: | 6 January 2023 |
Date of Acceptance: | 5 April 2022 |
Last Modified: | 13 Nov 2024 16:15 |
URI: | https://orca.cardiff.ac.uk/id/eprint/155516 |
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