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Doppler boosting the stochastic gravitational wave background

Giulia Cusin, Gianmassimo Tasinato Orcid Logo

Journal of Cosmology and Astroparticle Physics, Volume: 2022, Issue: 08, Start page: 036

Swansea University Author: Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.1088/1475-7516/2022/08/036

Abstract

One of the guaranteed features of the stochastic gravitational wave background (SGWB) is the presence of Doppler anisotropies induced by the motion of the detector with respect to the rest frame of the SGWB source. We point out that kinematic effects can be amplified if the SGWB is characterised by...

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Published in: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
Published: IOP Publishing 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60509
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first_indexed 2022-08-02T10:22:16Z
last_indexed 2023-01-13T19:20:41Z
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spelling 2022-11-01T13:05:46.5162493 v2 60509 2022-07-15 Doppler boosting the stochastic gravitational wave background cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2022-07-15 SPH One of the guaranteed features of the stochastic gravitational wave background (SGWB) is the presence of Doppler anisotropies induced by the motion of the detector with respect to the rest frame of the SGWB source. We point out that kinematic effects can be amplified if the SGWB is characterised by large tilts in its spectrum as a function of frequency, or by sizeable intrinsic anisotropies. Hence we examine the possibility to use Doppler effects as complementary probes of the SGWB frequency profile. For this purpose we work in multipole space, and we study the effect of kinematic modulation and aberration on the GW energy density parameter and on its angular power spectrum. We develop a Fisher forecast analysis and we discuss prospects for constraining parameters controlling kinematically induced anisotropies with future detector networks. As a case study, we apply our framework to a background component with constant slope in frequency, potentially detectable by a network of future ground-based interferometers. For this specific example, we show that a measurement of kinematic anisotropies with a network of Einstein Telescope and Cosmic Explorer will allow us to constrain the spectral shape with a precision of about 16%. We also show that, if a reconstruction of the spectral shape is done via other methods, e.g. frequency binning, a study of kinematic anisotropies can allow one to constrain our peculiar velocity with respect to the CMB frame with a precision of 30%. Finally, we identify cosmological and astrophysical scenarios where kinematic effects are enhanced in frequency ranges probed by current and future GW experiments. Journal Article Journal of Cosmology and Astroparticle Physics 2022 08 036 IOP Publishing 1475-7516 gravitational wave detectors, gravitational waves / theory 19 8 2022 2022-08-19 10.1088/1475-7516/2022/08/036 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University SU Library paid the OA fee (TA Institutional Deal) GC is funded by Swiss National Science Foundation (Ambizione Grant). GT is partially funded by the STFC grant ST/T000813/1. 2022-11-01T13:05:46.5162493 2022-07-15T17:38:18.1042264 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Giulia Cusin 1 Gianmassimo Tasinato 0000-0002-9835-4864 2 60509__25076__18d00b619cab4acf9c5cf88e8fce39ed.pdf 60509_VoR.pdf 2022-09-05T16:38:54.5102607 Output 2074735 application/pdf Version of Record true Copyright: 2022 The Author(s). Released under the terms of the Creative Commons Attribution 4.0 licence true eng http://creativecommons.org/licenses/by/4.0/
title Doppler boosting the stochastic gravitational wave background
spellingShingle Doppler boosting the stochastic gravitational wave background
Gianmassimo Tasinato
title_short Doppler boosting the stochastic gravitational wave background
title_full Doppler boosting the stochastic gravitational wave background
title_fullStr Doppler boosting the stochastic gravitational wave background
title_full_unstemmed Doppler boosting the stochastic gravitational wave background
title_sort Doppler boosting the stochastic gravitational wave background
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Giulia Cusin
Gianmassimo Tasinato
format Journal article
container_title Journal of Cosmology and Astroparticle Physics
container_volume 2022
container_issue 08
container_start_page 036
publishDate 2022
institution Swansea University
issn 1475-7516
doi_str_mv 10.1088/1475-7516/2022/08/036
publisher IOP Publishing
college_str Faculty of Science and Engineering
hierarchytype
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 One of the guaranteed features of the stochastic gravitational wave background (SGWB) is the presence of Doppler anisotropies induced by the motion of the detector with respect to the rest frame of the SGWB source. We point out that kinematic effects can be amplified if the SGWB is characterised by large tilts in its spectrum as a function of frequency, or by sizeable intrinsic anisotropies. Hence we examine the possibility to use Doppler effects as complementary probes of the SGWB frequency profile. For this purpose we work in multipole space, and we study the effect of kinematic modulation and aberration on the GW energy density parameter and on its angular power spectrum. We develop a Fisher forecast analysis and we discuss prospects for constraining parameters controlling kinematically induced anisotropies with future detector networks. As a case study, we apply our framework to a background component with constant slope in frequency, potentially detectable by a network of future ground-based interferometers. For this specific example, we show that a measurement of kinematic anisotropies with a network of Einstein Telescope and Cosmic Explorer will allow us to constrain the spectral shape with a precision of about 16%. We also show that, if a reconstruction of the spectral shape is done via other methods, e.g. frequency binning, a study of kinematic anisotropies can allow one to constrain our peculiar velocity with respect to the CMB frame with a precision of 30%. Finally, we identify cosmological and astrophysical scenarios where kinematic effects are enhanced in frequency ranges probed by current and future GW experiments.
published_date 2022-08-19T04:18:40Z
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score 11.013371

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