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Exponential quintessence: curved, steep and stringy?
Journal of High Energy Physics, Volume: 2024, Issue: 8, Start page: 117
Swansea University Author:
Ivonne Zavala Carrasco
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DOI (Published version): 10.1007/jhep08(2024)117
Abstract
We explore the possibility that our universe’s current accelerated expansion is explained by a quintessence model with an exponential scalar potential, V = V0e−λ ϕ, keeping an eye towards λ ≥ √2 and an open universe, favorable to a string theory realisation and with no cosmological horizon. We work...
Published in: | Journal of High Energy Physics |
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ISSN: | 1029-8479 |
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Springer Science and Business Media LLC
2024
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URI: | https://cronfa.swan.ac.uk/Record/cronfa68372 |
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We work out the full cosmology of the model, including matter, radiation, and optionally negative spatial curvature, for all λ > 0, performing an extensive analysis of the dynamical system and its phase space. The minimal physical requirements of a past epoch of radiation domination and an accelerated expansion today lead to an upper bound λ ≲ √3, which is driven slightly up in the presence of observationally allowed spatial curvature. Cosmological solutions start universally in a kination epoch, go through radiation and matter dominated phases and enter an epoch of acceleration, which is only transient for λ > √2. Field distances traversed between BBN and today are sub-Planckian. We discuss possible string theory origins and phenomenological challenges, such as time variation of fundamental constants. 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2025-01-20T13:06:36.5693749 v2 68372 2024-11-28 Exponential quintessence: curved, steep and stringy? 2fb8d4bb665e9a89d3b3478c17f646f8 0000-0002-5589-9928 Ivonne Zavala Carrasco Ivonne Zavala Carrasco true false 2024-11-28 BGPS We explore the possibility that our universe’s current accelerated expansion is explained by a quintessence model with an exponential scalar potential, V = V0e−λ ϕ, keeping an eye towards λ ≥ √2 and an open universe, favorable to a string theory realisation and with no cosmological horizon. We work out the full cosmology of the model, including matter, radiation, and optionally negative spatial curvature, for all λ > 0, performing an extensive analysis of the dynamical system and its phase space. The minimal physical requirements of a past epoch of radiation domination and an accelerated expansion today lead to an upper bound λ ≲ √3, which is driven slightly up in the presence of observationally allowed spatial curvature. Cosmological solutions start universally in a kination epoch, go through radiation and matter dominated phases and enter an epoch of acceleration, which is only transient for λ > √2. Field distances traversed between BBN and today are sub-Planckian. We discuss possible string theory origins and phenomenological challenges, such as time variation of fundamental constants. We provide theoretical predictions for the model parameters to be fitted to data, most notably the varying dark energy equation of state parameter, in light of recent results from DES-Y5 and DESI. Journal Article Journal of High Energy Physics 2024 8 117 Springer Science and Business Media LLC 1029-8479 Cosmological models, Cosmology of Theories BSM, String and Brane Phenomenology 14 8 2024 2024-08-14 10.1007/jhep08(2024)117 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee We would like to thank A. Moradinezhad, V. Poulin, N. Schöneberg and G. Tringas for very helpful discussions. We also thank the organisers of the String Phenomenology 2023 Conference, that allowed interactions leading to this work. The work of S. L. P. is partially supported by the U.K. Science and Technology Facilities Council grant ST/X000699/1. The work of T. W. is supported in part by the NSF grant PHY-2210271. I. Z. is partially funded by the STFC grants ST/T000813/1 and ST/X000648/1. This research was supported in part by grant NSF PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP). For the purpose of open access, the authors have applied a Creative Commons Attribution licence to any Author Accepted Manuscript version arising. 2025-01-20T13:06:36.5693749 2024-11-28T13:19:25.3726142 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics David Andriot 0000-0002-4552-7311 1 Susha Parameswaran 0000-0001-9804-2476 2 Dimitrios Tsimpis 0000-0002-0445-3416 3 Timm Wrase 0000-0002-7294-3580 4 Ivonne Zavala Carrasco 0000-0002-5589-9928 5 68372__32993__b7339d84fc8a40a98c630698c482368a.pdf 13130_2024_Article_24251.pdf 2024-11-28T13:19:25.3725693 Output 5701054 application/pdf Version of Record true © The Authors. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY4.0). true eng http://creativecommons.org/licenses/by/4.0/ |
title |
Exponential quintessence: curved, steep and stringy? |
spellingShingle |
Exponential quintessence: curved, steep and stringy? Ivonne Zavala Carrasco |
title_short |
Exponential quintessence: curved, steep and stringy? |
title_full |
Exponential quintessence: curved, steep and stringy? |
title_fullStr |
Exponential quintessence: curved, steep and stringy? |
title_full_unstemmed |
Exponential quintessence: curved, steep and stringy? |
title_sort |
Exponential quintessence: curved, steep and stringy? |
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2fb8d4bb665e9a89d3b3478c17f646f8 |
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2fb8d4bb665e9a89d3b3478c17f646f8_***_Ivonne Zavala Carrasco |
author |
Ivonne Zavala Carrasco |
author2 |
David Andriot Susha Parameswaran Dimitrios Tsimpis Timm Wrase Ivonne Zavala Carrasco |
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We explore the possibility that our universe’s current accelerated expansion is explained by a quintessence model with an exponential scalar potential, V = V0e−λ ϕ, keeping an eye towards λ ≥ √2 and an open universe, favorable to a string theory realisation and with no cosmological horizon. We work out the full cosmology of the model, including matter, radiation, and optionally negative spatial curvature, for all λ > 0, performing an extensive analysis of the dynamical system and its phase space. The minimal physical requirements of a past epoch of radiation domination and an accelerated expansion today lead to an upper bound λ ≲ √3, which is driven slightly up in the presence of observationally allowed spatial curvature. Cosmological solutions start universally in a kination epoch, go through radiation and matter dominated phases and enter an epoch of acceleration, which is only transient for λ > √2. Field distances traversed between BBN and today are sub-Planckian. We discuss possible string theory origins and phenomenological challenges, such as time variation of fundamental constants. We provide theoretical predictions for the model parameters to be fitted to data, most notably the varying dark energy equation of state parameter, in light of recent results from DES-Y5 and DESI. |
published_date |
2024-08-14T05:36:30Z |
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