Dark energy, D-branes and pulsar timing arrays

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

doi:10.1088/1475-7516/2023/11/090

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Dark energy, D-branes and pulsar timing arrays

Debika Chowdhury, Gianmassimo Tasinato

, Ivonne Zavala Carrasco

Journal of Cosmology and Astroparticle Physics, Volume: 2023, Issue: 11, Start page: 090

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

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DOI (Published version): 10.1088/1475-7516/2023/11/090

Abstract

Several pulsar timing array (PTA) collaborations recently announced the first detection of a stochastic gravitational wave (GW) background, leaving open the question of its source. We explore the possibility that it originates from cosmic inflation, a guaranteed source of primordial GW. The inflatio...

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Published in:	Journal of Cosmology and Astroparticle Physics
ISSN:	1475-7516
Published:	IOP Publishing 2023
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URI:	https://cronfa.swan.ac.uk/Record/cronfa65120
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first_indexed	2023-12-19T16:53:32Z
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spelling	v2 65120 2023-11-26 Dark energy, D-branes and pulsar timing arrays 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 2023-11-26 SPH Several pulsar timing array (PTA) collaborations recently announced the first detection of a stochastic gravitational wave (GW) background, leaving open the question of its source. We explore the possibility that it originates from cosmic inflation, a guaranteed source of primordial GW. The inflationary GW background amplitude is enhanced at PTA scales by a non-standard early cosmological evolution, driven by Dirac-Born-Infeld (DBI) scalar dynamics motivated by string theory. The resulting GW energy density has a broken power-law frequency profile, entering the PTA band with a peak amplitude consistent with the recent GW detection. After this initial DBI kination epoch, the dynamics starts a new phase mainly controlled by the scalar potential. It provides a realization of an early dark energy scenario aimed at relaxing the H0 tension, and a late dark energy model which explains the current cosmological acceleration with no need of a cosmological constant. Hence our mechanism — besides providing a possible explanation for the recent PTA results — connects them with testable properties of the physics of the dark universe. Journal Article Journal of Cosmology and Astroparticle Physics 2023 11 090 IOP Publishing 1475-7516 Dark energy theory, gravitational waves / theory, Gravitational waves in GRand beyond: theory , physics of the early universe 24 11 2023 2023-11-24 10.1088/1475-7516/2023/11/090 http://dx.doi.org/10.1088/1475-7516/2023/11/090 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University The authors are partially funded by the STFC grant ST/T000813/1. 2023-12-19T16:57:46.6846268 2023-11-26T13:53:28.4310614 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 65120__29297__0c659e7deedf4ca7bc962e04017d52f4.pdf 65120.VOR.pdf 2023-12-19T16:52:11.8838391 Output 1586548 application/pdf Version of Record true © 2023 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Distributed under the terms of a Creative Commons Attribution 4.0 International License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title	Dark energy, D-branes and pulsar timing arrays
spellingShingle	Dark energy, D-branes and pulsar timing arrays Debika Chowdhury Gianmassimo Tasinato Ivonne Zavala Carrasco
title_short	Dark energy, D-branes and pulsar timing arrays
title_full	Dark energy, D-branes and pulsar timing arrays
title_fullStr	Dark energy, D-branes and pulsar timing arrays
title_full_unstemmed	Dark energy, D-branes and pulsar timing arrays
title_sort	Dark energy, D-branes and pulsar timing arrays
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	2023
container_issue	11
container_start_page	090
publishDate	2023
institution	Swansea University
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publisher	IOP Publishing
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url	http://dx.doi.org/10.1088/1475-7516/2023/11/090
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description	Several pulsar timing array (PTA) collaborations recently announced the first detection of a stochastic gravitational wave (GW) background, leaving open the question of its source. We explore the possibility that it originates from cosmic inflation, a guaranteed source of primordial GW. The inflationary GW background amplitude is enhanced at PTA scales by a non-standard early cosmological evolution, driven by Dirac-Born-Infeld (DBI) scalar dynamics motivated by string theory. The resulting GW energy density has a broken power-law frequency profile, entering the PTA band with a peak amplitude consistent with the recent GW detection. After this initial DBI kination epoch, the dynamics starts a new phase mainly controlled by the scalar potential. It provides a realization of an early dark energy scenario aimed at relaxing the H0 tension, and a late dark energy model which explains the current cosmological acceleration with no need of a cosmological constant. Hence our mechanism — besides providing a possible explanation for the recent PTA results — connects them with testable properties of the physics of the dark universe.
published_date	2023-11-24T16:57:47Z
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score	11.035634

Dark energy, D-branes and pulsar timing arrays

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