No Cover Image

Journal article 223 views 39 downloads

Exponential quintessence: curved, steep and stringy?

David Andriot Orcid Logo, Susha Parameswaran Orcid Logo, Dimitrios Tsimpis Orcid Logo, Timm Wrase Orcid Logo, Ivonne Zavala Carrasco Orcid Logo

Journal of High Energy Physics, Volume: 2024, Issue: 8, Start page: 117

Swansea University Author: Ivonne Zavala Carrasco Orcid Logo

  • 13130_2024_Article_24251.pdf

    PDF | Version of Record

    © The Authors. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY4.0).

    Download (5.44MB)

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...

Full description

Published in: Journal of High Energy Physics
ISSN: 1029-8479
Published: Springer Science and Business Media LLC 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa68372
first_indexed 2024-11-28T19:47:26Z
last_indexed 2025-01-20T20:34:59Z
id cronfa68372
recordtype SURis
fullrecord <?xml version="1.0"?><rfc1807><datestamp>2025-01-20T13:06:36.5693749</datestamp><bib-version>v2</bib-version><id>68372</id><entry>2024-11-28</entry><title>Exponential quintessence: curved, steep and stringy?</title><swanseaauthors><author><sid>2fb8d4bb665e9a89d3b3478c17f646f8</sid><ORCID>0000-0002-5589-9928</ORCID><firstname>Ivonne</firstname><surname>Zavala Carrasco</surname><name>Ivonne Zavala Carrasco</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2024-11-28</date><deptcode>BGPS</deptcode><abstract>We explore the possibility that our universe&#x2019;s current accelerated expansion is explained by a quintessence model with an exponential scalar potential, V = V0e&#x2212;&#x3BB; &#x3D5;, keeping an eye towards &#x3BB; &#x2265; &#x221A;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 &#x3BB; &gt; 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 &#x3BB; &#x2272; &#x221A;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 &#x3BB; &gt; &#x221A;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.</abstract><type>Journal Article</type><journal>Journal of High Energy Physics</journal><volume>2024</volume><journalNumber>8</journalNumber><paginationStart>117</paginationStart><paginationEnd/><publisher>Springer Science and Business Media LLC</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic>1029-8479</issnElectronic><keywords>Cosmological models, Cosmology of Theories BSM, String and Brane Phenomenology</keywords><publishedDay>14</publishedDay><publishedMonth>8</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-08-14</publishedDate><doi>10.1007/jhep08(2024)117</doi><url/><notes/><college>COLLEGE NANME</college><department>Biosciences Geography and Physics School</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>BGPS</DepartmentCode><institution>Swansea University</institution><apcterm>Another institution paid the OA fee</apcterm><funders>We would like to thank A. Moradinezhad, V. Poulin, N. Sch&#xF6;neberg 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.</funders><projectreference/><lastEdited>2025-01-20T13:06:36.5693749</lastEdited><Created>2024-11-28T13:19:25.3726142</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Physics</level></path><authors><author><firstname>David</firstname><surname>Andriot</surname><orcid>0000-0002-4552-7311</orcid><order>1</order></author><author><firstname>Susha</firstname><surname>Parameswaran</surname><orcid>0000-0001-9804-2476</orcid><order>2</order></author><author><firstname>Dimitrios</firstname><surname>Tsimpis</surname><orcid>0000-0002-0445-3416</orcid><order>3</order></author><author><firstname>Timm</firstname><surname>Wrase</surname><orcid>0000-0002-7294-3580</orcid><order>4</order></author><author><firstname>Ivonne</firstname><surname>Zavala Carrasco</surname><orcid>0000-0002-5589-9928</orcid><order>5</order></author></authors><documents><document><filename>68372__32993__b7339d84fc8a40a98c630698c482368a.pdf</filename><originalFilename>13130_2024_Article_24251.pdf</originalFilename><uploaded>2024-11-28T13:19:25.3725693</uploaded><type>Output</type><contentLength>5701054</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><documentNotes>&#xA9; The Authors. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY4.0).</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language><licence>http://creativecommons.org/licenses/by/4.0/</licence></document></documents><OutputDurs/></rfc1807>
spelling 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?
author_id_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8
author_id_fullname_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8_***_Ivonne Zavala Carrasco
author Ivonne Zavala Carrasco
author2 David Andriot
Susha Parameswaran
Dimitrios Tsimpis
Timm Wrase
Ivonne Zavala Carrasco
format Journal article
container_title Journal of High Energy Physics
container_volume 2024
container_issue 8
container_start_page 117
publishDate 2024
institution Swansea University
issn 1029-8479
doi_str_mv 10.1007/jhep08(2024)117
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description 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
_version_ 1836508501947449344
score 11.380731