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Gravitational wave nonlinearities and pulsar-timing array angular correlations

Gianmassimo Tasinato Orcid Logo

Physical Review D, Volume: 105, Issue: 8

Swansea University Author: Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.1103/physrevd.105.083506

Abstract

Several pulsar-timing array (PTA) collaborations are finding tantalizing hints for a stochastic gravitational wave background signal in the nano-Hertz regime. So far, though, no convincing evidence for the expected Hellings-Downs quadrupolar correlations has been found. While this issue might get fi...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS) 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa59811
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last_indexed 2023-01-11T14:41:19Z
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spelling 2022-08-16T14:25:22.3954835 v2 59811 2022-04-13 Gravitational wave nonlinearities and pulsar-timing array angular correlations cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2022-04-13 SPH Several pulsar-timing array (PTA) collaborations are finding tantalizing hints for a stochastic gravitational wave background signal in the nano-Hertz regime. So far, though, no convincing evidence for the expected Hellings-Downs quadrupolar correlations has been found. While this issue might get fixed at the light of more accurate, forthcoming data, it is important to keep an eye open on different possibilities and explore scenarios able to produce different types of PTA angular correlations. We point out that a stationary non-Gaussian component to the gravitational wave background can modulate the two-point PTA overlap reduction function, adding contributions that can help in fitting the angular distribution of PTA data. We discuss possible sources for such non-Gaussian signal in terms of cosmological processes occurring after inflation ends, and we investigate further tests for this idea. Journal Article Physical Review D 105 8 American Physical Society (APS) 2470-0010 2470-0029 11 4 2022 2022-04-11 10.1103/physrevd.105.083506 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University Not Required G. T. is partially supported by the STFC Grant No. ST/T000813/1. 2022-08-16T14:25:22.3954835 2022-04-13T07:04:25.8552444 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gianmassimo Tasinato 0000-0002-9835-4864 1 59811__23864__3219e99369a94238baf893486e744a4d.pdf 2203.15440.pdf 2022-04-14T14:19:31.1155007 Output 712398 application/pdf Accepted Manuscript true true eng
title Gravitational wave nonlinearities and pulsar-timing array angular correlations
spellingShingle Gravitational wave nonlinearities and pulsar-timing array angular correlations
Gianmassimo Tasinato
title_short Gravitational wave nonlinearities and pulsar-timing array angular correlations
title_full Gravitational wave nonlinearities and pulsar-timing array angular correlations
title_fullStr Gravitational wave nonlinearities and pulsar-timing array angular correlations
title_full_unstemmed Gravitational wave nonlinearities and pulsar-timing array angular correlations
title_sort Gravitational wave nonlinearities and pulsar-timing array angular correlations
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Gianmassimo Tasinato
format Journal article
container_title Physical Review D
container_volume 105
container_issue 8
publishDate 2022
institution Swansea University
issn 2470-0010
2470-0029
doi_str_mv 10.1103/physrevd.105.083506
publisher American Physical Society (APS)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Several pulsar-timing array (PTA) collaborations are finding tantalizing hints for a stochastic gravitational wave background signal in the nano-Hertz regime. So far, though, no convincing evidence for the expected Hellings-Downs quadrupolar correlations has been found. While this issue might get fixed at the light of more accurate, forthcoming data, it is important to keep an eye open on different possibilities and explore scenarios able to produce different types of PTA angular correlations. We point out that a stationary non-Gaussian component to the gravitational wave background can modulate the two-point PTA overlap reduction function, adding contributions that can help in fitting the angular distribution of PTA data. We discuss possible sources for such non-Gaussian signal in terms of cosmological processes occurring after inflation ends, and we investigate further tests for this idea.
published_date 2022-04-11T04:17:23Z
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