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Cosmological constraints on curved quintessence
,
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...
| Published in: | Journal of Cosmology and Astroparticle Physics |
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| ISSN: | 1475-7516 |
| Published: |
IOP Publishing
2024
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa67849 |
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| 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-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. |
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| Keywords: |
dark energy theory, dark energy experiments |
| College: |
Faculty of Science and Engineering |
| Issue: |
09 |
| Start Page: |
073 |