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  Coherently combining short data segments for all-sky semi-coherent continuous gravitational wave searches

Goetz, E., & Riles, K. (2016). Coherently combining short data segments for all-sky semi-coherent continuous gravitational wave searches. Classical and quantum gravity, 33(8): 085007. doi:10.1088/0264-9381/33/8/085007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-80DA-B Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EC60-8
Genre: Journal Article

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 Creators:
Goetz, Evan1, Author              
Riles, Keith, Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM
 Abstract: We present a method for coherently combining short data segments from gravitational-wave detectors to improve the sensitivity of semi-coherent searches for continuous gravitational waves. All-sky searches for continuous gravitational waves from unknown sources are computationally limited. The semi-coherent approach reduces the computational cost by dividing the entire observation timespan into short segments to be analyzed coherently, then combined together incoherently. Semi-coherent analyses that attempt to improve sensitivity by coherently combining data from multiple detectors face a computational challenge in accounting for uncertainties in signal parameters. In this article, we lay out a technique to meet this challenge using summed Fourier transform coefficients. Applying this technique to one all-sky search algorithm called TwoSpect, we confirm that the sensitivity of all-sky, semi-coherent searches can be improved by coherently combining the short data segments. For misaligned detectors, however, this improvement requires careful attention when marginalizing over unknown polarization parameters. In addition, care must be taken in correcting for differential detector velocity due to the Earth's rotation for high signal frequencies and widely separated detectors.

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 Dates: 2015-10-222016
 Publication Status: Published in print
 Pages: 15 pages, 3 figures, 1 table
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1510.06820
DOI: 10.1088/0264-9381/33/8/085007
URI: http://arxiv.org/abs/1510.06820
 Degree: -

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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: 33 (8) Sequence Number: 085007 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: /journals/resource/954925513480_1