The rise of the primordial tensor spectrum from an early scalar-tensor epoch

Chowdhury, Debika; Tasinato, Gianmassimo; Carrasco, Ivonne Zavala

doi:10.1088/1475-7516/2022/08/010

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The rise of the primordial tensor spectrum from an early scalar-tensor epoch

Debika Chowdhury, Gianmassimo Tasinato

, Ivonne Zavala Carrasco

Journal of Cosmology and Astroparticle Physics, Volume: 2022, Issue: 08, Start page: 010

Swansea University Authors: Debika Chowdhury, Gianmassimo Tasinato , Ivonne Zavala Carrasco

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DOI (Published version): 10.1088/1475-7516/2022/08/010

Abstract

Primordial gravitational waves (PGW) produced during inflation span a large range of frequencies, carrying information on the dynamics of the primordial universe. During an early scalar-tensor dominated epoch, the amplitude of the PGW spectrum can be enhanced over a wide range of frequencies. To stu...

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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/cronfa60779
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first_indexed	2022-08-24T12:08:03Z
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spelling	2022-08-24T13:10:30.2438332 v2 60779 2022-08-08 The rise of the primordial tensor spectrum from an early scalar-tensor epoch c726433050640576f6d649ed6f654826 Debika Chowdhury Debika Chowdhury true false cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2fb8d4bb665e9a89d3b3478c17f646f8 0000-0002-5589-9928 Ivonne Zavala Carrasco Ivonne Zavala Carrasco true false 2022-08-08 SPH Primordial gravitational waves (PGW) produced during inflation span a large range of frequencies, carrying information on the dynamics of the primordial universe. During an early scalar-tensor dominated epoch, the amplitude of the PGW spectrum can be enhanced over a wide range of frequencies. To study this phenomenon, we focus on a class of scalar-tensor theories, well motivated by high energy theories of dark energy and dark matter, where the scalar is conformally and disformally coupled to matter during the early cosmological evolution. For a conformally dominated epoch, the PGW spectrum has a flat step-like shape. More interestingly, a disformally dominated epoch is characterised by a peaked spectrum with a broken power-law profile, with slopes depending on the scalar-tensor theory considered. We introduce a graphical tool, called broken power-law sensitivity curve, as a convenient visual indicator for understanding whether a given broken power-law profile can be detected by GW experiments. We then analyse the GW spectra for a variety of representative conformal and disformal models, discussing their detectability prospects with the Einstein Telescope (ET), Laser Interferometer Space Antenna (LISA), DECi-hertz Interferometer Gravitational wave Observatory (DECIGO), and Big Bang Observer (BBO). Journal Article Journal of Cosmology and Astroparticle Physics 2022 08 010 IOP Publishing 1475-7516 Gravitational waves in GR and beyond: theory, physics of the early universe, primordial gravitational waves (theory), gravitational waves / theory 8 8 2022 2022-08-08 10.1088/1475-7516/2022/08/010 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University SU Library paid the OA fee (TA Institutional Deal) D. C. acknowledges the support of the Supercomputing Wales project, which is part-funded by the European Regional Development Fund (ERDF) via Welsh Government. D. C. would also like to thank H. V. Ragavendra for discussions. This work is part-funded by the STFC grant ST/T000813/1. 2022-08-24T13:10:30.2438332 2022-08-08T17:43:21.3011224 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Debika Chowdhury 1 Gianmassimo Tasinato 0000-0002-9835-4864 2 Ivonne Zavala Carrasco 0000-0002-5589-9928 3 60779__25008__133f97adf8884246b476a05e5a68cce9.pdf 60779_VoR.pdf 2022-08-24T13:04:40.0941521 Output 2883073 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	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
spellingShingle	The rise of the primordial tensor spectrum from an early scalar-tensor epoch Debika Chowdhury Gianmassimo Tasinato Ivonne Zavala Carrasco
title_short	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
title_full	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
title_fullStr	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
title_full_unstemmed	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
title_sort	The rise of the primordial tensor spectrum from an early scalar-tensor epoch
author_id_str_mv	c726433050640576f6d649ed6f654826 cb754b073d1e4949c5e3db97744d3301 2fb8d4bb665e9a89d3b3478c17f646f8
author_id_fullname_str_mv	c726433050640576f6d649ed6f654826_*_Debika Chowdhury cb754b073d1e4949c5e3db97744d3301__Gianmassimo Tasinato 2fb8d4bb665e9a89d3b3478c17f646f8_**_Ivonne Zavala Carrasco
author	Debika Chowdhury Gianmassimo Tasinato Ivonne Zavala Carrasco
author2	Debika Chowdhury Gianmassimo Tasinato Ivonne Zavala Carrasco
format	Journal article
container_title	Journal of Cosmology and Astroparticle Physics
container_volume	2022
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publishDate	2022
institution	Swansea University
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doi_str_mv	10.1088/1475-7516/2022/08/010
publisher	IOP Publishing
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description	Primordial gravitational waves (PGW) produced during inflation span a large range of frequencies, carrying information on the dynamics of the primordial universe. During an early scalar-tensor dominated epoch, the amplitude of the PGW spectrum can be enhanced over a wide range of frequencies. To study this phenomenon, we focus on a class of scalar-tensor theories, well motivated by high energy theories of dark energy and dark matter, where the scalar is conformally and disformally coupled to matter during the early cosmological evolution. For a conformally dominated epoch, the PGW spectrum has a flat step-like shape. More interestingly, a disformally dominated epoch is characterised by a peaked spectrum with a broken power-law profile, with slopes depending on the scalar-tensor theory considered. We introduce a graphical tool, called broken power-law sensitivity curve, as a convenient visual indicator for understanding whether a given broken power-law profile can be detected by GW experiments. We then analyse the GW spectra for a variety of representative conformal and disformal models, discussing their detectability prospects with the Einstein Telescope (ET), Laser Interferometer Space Antenna (LISA), DECi-hertz Interferometer Gravitational wave Observatory (DECIGO), and Big Bang Observer (BBO).
published_date	2022-08-08T04:19:10Z
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score	11.013148

The rise of the primordial tensor spectrum from an early scalar-tensor epoch

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