Cosmological constraints on curved quintessence

Bhattacharya, Sukannya; Borghetto, Giulia; Malhotra, Ameek; Parameswaran, Susha; Tasinato, Gianmassimo; Carrasco, Ivonne Zavala

doi:10.1088/1475-7516/2024/09/073

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Cosmological constraints on curved quintessence

Sukannya Bhattacharya, Giulia Borghetto, Ameek Malhotra

, Susha Parameswaran, Gianmassimo Tasinato

, Ivonne Zavala Carrasco

Journal of Cosmology and Astroparticle Physics, Volume: 2024, Issue: 09, Start page: 073

Swansea University Authors: Giulia Borghetto, Ameek Malhotra , Gianmassimo Tasinato , Ivonne Zavala Carrasco

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DOI (Published version): 10.1088/1475-7516/2024/09/073

Abstract

Dynamical dark energy has gained renewed interest due to recent theoretical and observational developments. In the present paper, we focus on a string-motivated dark energy set-up, and perform a detailed cosmological analysis of exponential quintessence with potential V = V0 eλϕ-, allowing for non-z...

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Published in:	Journal of Cosmology and Astroparticle Physics
ISSN:	1475-7516
Published:	IOP Publishing 2024
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spelling	v2 67849 2024-09-27 Cosmological constraints on curved quintessence ebce2761d51e17f9a68f90911dd36b5f Giulia Borghetto Giulia Borghetto true false dd6ebf069325cdbdbeb597fa64d48063 0000-0001-8346-9995 Ameek Malhotra Ameek Malhotra 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 2024-09-27 MACS Dynamical dark energy has gained renewed interest due to recent theoretical and observational developments. In the present paper, we focus on a string-motivated dark energy set-up, and perform a detailed cosmological analysis of exponential quintessence with potential V = V0 eλϕ-, allowing for non-zero spatial curvature. We first gain some physical intuition into the full evolution of such a scenario by analysing the corresponding dynamical system. Then, we test the model using a combination of Planck CMB data, DESI BAO data, as well as recent supernovae datasets. For the model parameter λ, we obtain a preference for nonzero values: λ = 0.48+0.28-0.21, 0.68+0.31-0.20, 0.77+0.18-0.15 at 68% C.L. when combining CMB+DESI with Pantheon+, Union3 and DES-Y5 supernovae datasets respectively. We find no significant hint for spatial curvature. We discuss the implications of current cosmological results for the exponential quintessence model, and more generally for dark energy in string theory. Journal Article Journal of Cosmology and Astroparticle Physics 2024 09 073 IOP Publishing 1475-7516 dark energy theory, dark energy experiments 27 9 2024 2024-09-27 10.1088/1475-7516/2024/09/073 COLLEGE NANME Mathematics and Computer Science School COLLEGE CODE MACS Swansea University 2024-10-10T13:56:30.8591272 2024-09-27T17:12:33.5162699 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Sukannya Bhattacharya 1 Giulia Borghetto 2 Ameek Malhotra 0000-0001-8346-9995 3 Susha Parameswaran 4 Gianmassimo Tasinato 0000-0002-9835-4864 5 Ivonne Zavala Carrasco 0000-0002-5589-9928 6 67849__32582__6ac6c7727637420e90de578d36c01f3f.pdf 67849.VoR.pdf 2024-10-10T13:47:13.7814880 Output 5191322 application/pdf Version of Record true © 2024 The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. true eng http://creativecommons.org/licenses/by/4.0/
title	Cosmological constraints on curved quintessence
spellingShingle	Cosmological constraints on curved quintessence Giulia Borghetto Ameek Malhotra Gianmassimo Tasinato Ivonne Zavala Carrasco
title_short	Cosmological constraints on curved quintessence
title_full	Cosmological constraints on curved quintessence
title_fullStr	Cosmological constraints on curved quintessence
title_full_unstemmed	Cosmological constraints on curved quintessence
title_sort	Cosmological constraints on curved quintessence
author_id_str_mv	ebce2761d51e17f9a68f90911dd36b5f dd6ebf069325cdbdbeb597fa64d48063 cb754b073d1e4949c5e3db97744d3301 2fb8d4bb665e9a89d3b3478c17f646f8
author_id_fullname_str_mv	ebce2761d51e17f9a68f90911dd36b5f_*_Giulia Borghetto dd6ebf069325cdbdbeb597fa64d48063__Ameek Malhotra cb754b073d1e4949c5e3db97744d3301__Gianmassimo Tasinato 2fb8d4bb665e9a89d3b3478c17f646f8_*_Ivonne Zavala Carrasco
author	Giulia Borghetto Ameek Malhotra Gianmassimo Tasinato Ivonne Zavala Carrasco
author2	Sukannya Bhattacharya Giulia Borghetto Ameek Malhotra Susha Parameswaran Gianmassimo Tasinato Ivonne Zavala Carrasco
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description	Dynamical dark energy has gained renewed interest due to recent theoretical and observational developments. In the present paper, we focus on a string-motivated dark energy set-up, and perform a detailed cosmological analysis of exponential quintessence with potential V = V0 eλϕ-, allowing for non-zero spatial curvature. We first gain some physical intuition into the full evolution of such a scenario by analysing the corresponding dynamical system. Then, we test the model using a combination of Planck CMB data, DESI BAO data, as well as recent supernovae datasets. For the model parameter λ, we obtain a preference for nonzero values: λ = 0.48+0.28-0.21, 0.68+0.31-0.20, 0.77+0.18-0.15 at 68% C.L. when combining CMB+DESI with Pantheon+, Union3 and DES-Y5 supernovae datasets respectively. We find no significant hint for spatial curvature. We discuss the implications of current cosmological results for the exponential quintessence model, and more generally for dark energy in string theory.
published_date	2024-09-27T13:56:31Z
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score	11.030802

Cosmological constraints on curved quintessence

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