Generalized application of the Viterbi algorithm to searches for continuous gravitational-wave signals

Bayley, J. , Messenger, C. and Woan, G. (2019) Generalized application of the Viterbi algorithm to searches for continuous gravitational-wave signals. Physical Review D, 100(2), 023006. (doi: 10.1103/PhysRevD.100.023006)

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Abstract

All-sky and wide parameter space searches for continuous gravitational waves are generally template-matching schemes which test a bank of signal waveforms against data from a gravitational wave detector. Such searches can offer optimal sensitivity for a given computing cost and signal model, but are highly-tuned to specific signal types and are computationally expensive, even for semicoherent searches. We have developed a search method based on the well-known Viterbi algorithm which is model-agnostic and has a computational cost several orders of magnitude lower than template methods, with a modest reduction in sensitivity. In particular, this method can search for signals which have an unknown frequency evolution. We test the algorithm on three simulated and real data sets: gapless Gaussian noise, Gaussian noise with gaps and real data from the final run of initial LIGO (S6). We show that at 95% efficiency, with a 1% false alarm rate, the algorithm has a depth sensitivity of ∼ 33 , 10 and 13    Hz − 1 / 2 with corresponding SNRs of ∼ 60 , 72 and 74 in these datasets. We discuss the use of this algorithm for detecting a wide range of quasimonochromatic gravitational wave signals and instrumental lines.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Woan, Professor Graham and Messenger, Dr Christopher and Bayley, Mr Joseph
Authors: Bayley, J., Messenger, C., and Woan, G.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:2470-0010
ISSN (Online):2470-0029
Published Online:17 July 2019
Copyright Holders:Copyright © 2019 American Physical Society
First Published:First published in Physical Review D 100(2): 023006
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
169451Investigations in Gravitational RadiationSheila RowanScience and Technology Facilities Council (STFC)ST/L000946/1P&S - Physics & Astronomy