Assessing the model waveform accuracy of gravitational waves

Hu, Q. and Veitch, J. (2022) Assessing the model waveform accuracy of gravitational waves. Physical Review D, 106(4), 044042. (doi: 10.1103/PhysRevD.106.044042)

Abstract

With the improvement in sensitivity of gravitational wave (GW) detectors and the increasing diversity of GW sources, there is a strong need for accurate GW waveform models for data analysis. While the current model accuracy assessments require waveforms generated by numerical relativity (NR) simulations as the "true waveforms,"in this paper we propose an assessment approach that does not require NR simulations, which enables us to assess model accuracy everywhere in the parameter space. By measuring the difference between two waveform models, we derive a necessary condition for a pair of waveform models to both be accurate, for a particular set of parameters. We then apply this method to the parameter estimation samples of the Gravitational-Wave Transient Catalogs GWTC-3 and GWTC-2.1, and find that the waveform accuracy for high signal-to-noise ratio events in some cases fails our assessment criterion. Based on analysis of real events' posterior samples, we discuss the correlation between our quantified accuracy assessments and systematic errors in parameter estimation. We find that waveform models that perform worse in our assessment are more likely to give inconsistent estimations. We also investigate waveform accuracy in different parameter regions, and find that the accuracy degrades as the spin effects go up, the mass ratio deviates from one, or the orbital plane is nearly aligned with the line of sight. Furthermore, we make predictions of waveform accuracy requirements for future detectors and find that the accuracy of current waveform models should be improved by at least 3 orders of magnitude, which is consistent with previous works.

• Item Type: Articles (Other)
• Additional Information: The authors are grateful for computational resources provided by the LIGO Lab at Caltech which is supported by National Science Foundation Grants PHY-0757058 and PHY-0823459. QH is supported by CSC. JV is supported by STFC grant ST/V005634/1.
• Keywords: Gravitational waves, binary stars.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hu, Mr Qian and Veitch, Dr John
• Authors: Hu, Q., and Veitch, J.
• Subjects: Q Science > QB Astronomy; Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Centre: College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 2470-0010
• ISSN (Online): 2470-0029
• Copyright Holders: Copyright © 2022 American Physical Society
• First Published: First published in Physical Review D 106(4):044042
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

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Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
312546		Investigations in Gravitational Radiation	Sheila Rowan	Science and Technology Facilities Council (STFC)	ST/V005634/1	ENG - Electronics & Nanoscale Engineering