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Effects of waveform model systematics on the interpretation of GW150914


Abbott, BP and Abbott, R and Siellez, K and Zweizig, J and Boyle, M and Chu, T and Hemberger, D and Hinder, I and Kidder, LE and Ossokine, S and Scheel, M and Szilagyi, B and Teukolsky, S and Vano Vinuales, A, LIGO Scientific Collaboration, Virgo Collaboration, Effects of waveform model systematics on the interpretation of GW150914, Classical and Quantum Gravity, 34, (10) Article 104002. ISSN 0264-9381 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 IOP Publishing Ltd

DOI: doi:10.1088/1361-6382/aa6854


Parameter estimates of GW150914 were obtained using Bayesian inference, based on three semi-analytic waveform models for binary black hole coalescences. These waveform models differ from each other in their treatment of black hole spins, and all three models make some simplifying assumptions, notably to neglect sub-dominant waveform harmonic modes and orbital eccentricity. Furthermore, while the models are calibrated to agree with waveforms obtained by full numerical solutions of Einsteinís equations, any such calibration is accurate only to some non-zero tolerance and is limited by the accuracy of the underlying phenomenology, availability, quality, and parameter-space coverage of numerical simulations. This paper complements the original analyses of GW150914 with an investigation of the effects of possible systematic errors in the waveform models on estimates of its source parameters. To test for systematic errors we repeat the original Bayesian analysis on mock signals from numerical simulations of a series of binary configurations with parameters similar to those found for GW150914. Overall, we find no evidence for a systematic bias relative to the statistical error of the original parameter recovery of GW150914 due to modeling approximations or modeling inaccuracies. However, parameter biases are found to occur for some configurations disfavored by the data of GW150914: for binaries inclined edge-on to the detector over a small range of choices of polarization angles, and also for eccentricities greater than ∼0.05. For signals with higher signal-to-noise ratio than GW150914, or in other regions of the binary parameter space (lower masses, larger mass ratios, or higher spins), we expect that systematic errors in current waveform models may impact gravitational-wave measurements, making more accurate models desirable for future observations.

Item Details

Item Type:Refereed Article
Keywords:Gravitational waves, numerical relativity, parameter estimation, waveform models, systematic errors, GW150914
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:General relativity and gravitational waves
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Siellez, K (Dr Karelle Siellez)
ID Code:152110
Year Published:2017
Web of Science® Times Cited:90
Deposited By:Physics
Deposited On:2022-08-11
Last Modified:2022-09-16

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