The return of GOLUM: improving distributed joint parameter estimation for strongly lensed gravitational waves

Justin Janquart*, K. Haris, Otto A. Hannuksela, Chris Van Den Broeck

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Owing to the forecasted improved sensitivity of ground-based gravitational-wave detectors, new research avenues will become accessible. This is the case for gravitational-wave strong lensing, predicted with a non-negligible observation rate in the coming years. However, because one needs to investigate all the event pairs in the data, searches for strongly lensed gravitational waves are often computationally heavy, and one faces high false-alarm rates. In this paper, we present upgrades made to the GOLUM software, making it more reliable while increasing its speed by re-casting the look-up table, imposing a sample control, and implementing symmetric runs on the two lensed images. We show how the recovered posteriors have improved coverage of the parameter space and how we increase the pipeline’s stability. Finally, we show the results obtained by performing a joint analysis of all the events reported until the GWTC-3 catalogue, finding similar conclusions to the ones presented in the literature.

Original languageEnglish
Pages (from-to)3088-3098
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume526
Issue number2
DOIs
Publication statusPublished - 1 Dec 2023

Bibliographical note

Publisher Copyright:
© 2023 Oxford University Press. All rights reserved.

Funding

The authors thank Harsh Narola, Sylvia Biscoveanu, and John Vietch for useful discussions. We also thank Mick Wright for carefully re-reading the manuscript. JJ, KH, and CVDB are supported by the research program of the Netherlands Organisation for Scientific Research (NWO). The authors are grateful for computational resources provided by the LIGO Laboratory and supported by the National Science Foundation Grant Nos. PHY-0757058 and PHY-0823459. This material is based upon work supported by NSF’s LIGO Laboratory which is a major facility fully funded by the National Science Foundation. The authors thank Harsh Narola, Sylvia Biscoveanu, and John Vietch for useful discussions. We also thank Mick Wright for carefully re-reading the manuscript. JJ, KH, and CVDB are supported by the research program of the Netherlands Organisation for Scientific Research (NWO). The authors are grateful for computational resources provided by the LIGO Laboratory and supported by the National Science Foundation Grant Nos. PHY-0757058 and PHY-0823459. This material is based upon work supported by NSF’s LIGO Laboratory which is a major facility fully funded by the National Science Foundation.

FundersFunder number
Harsh Narola
Sylvia Biscoveanu
National Science FoundationPHY-0823459, PHY-0757058
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

    Keywords

    • gravitational lensing: strong
    • gravitational waves

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