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  Line-robust statistics for continuous gravitational waves: safety in the case of unequal detector sensitivities

Keitel, D., & Prix, R. (2015). Line-robust statistics for continuous gravitational waves: safety in the case of unequal detector sensitivities. Classical and quantum gravity, 32: 035004. doi:10.1088/0264-9381/32/3/035004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-D3E0-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-D3E1-B
Genre: Journal Article

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 Creators:
Keitel, David1, Author              
Prix, Reinhard2, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: The multi-detector F-statistic is close to optimal for detecting continuous gravitational waves (CWs) in Gaussian noise. However, it is susceptible to false alarms from instrumental artefacts, for example quasi-monochromatic disturbances ('lines'), which resemble a CW signal more than Gaussian noise. In a recent paper [Keitel et al 2014, PRD 89 064023], a Bayesian model selection approach was used to derive line-robust detection statistics for CW signals, generalising both the F-statistic and the F-statistic consistency veto technique and yielding improved performance in line-affected data. Here we investigate a generalisation of the assumptions made in that paper: if a CW analysis uses data from two or more detectors with very different sensitivities, the line-robust statistics could be less effective. We investigate the boundaries within which they are still safe to use, in comparison with the F-statistic. Tests using synthetic draws show that the optimally-tuned version of the original line-robust statistic remains safe in most cases of practical interest. We also explore a simple idea on further improving the detection power and safety of these statistics, which we however find to be of limited practical use.

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 Dates: 2014-09-092015-01-162015
 Publication Status: Published in print
 Pages: 21 pages, 11 figures, updated to match published version
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1409.2696
DOI: 10.1088/0264-9381/32/3/035004
URI: http://arxiv.org/abs/1409.2696
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Title: Classical and quantum gravity
Source Genre: Journal
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Publ. Info: Bristol, U.K. : Institute of Physics
Pages: - Volume / Issue: 32 Sequence Number: 035004 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: /journals/resource/954925513480_1