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Dark D-brane cosmology

Tomi Koivisto, Danielle Wills, Ivonne Zavala, Ivonne Zavala Carrasco Orcid Logo

Journal of Cosmology and Astroparticle Physics, Volume: 2014, Issue: 06, Pages: 036 - 036

Swansea University Author: Ivonne Zavala Carrasco Orcid Logo

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DOI (Published version): 10.1088/1475-7516/2014/06/036

Abstract

Disformally coupled cosmologies arise from Dirac-Born-Infeld actions in Type II string theories, when matter resides on a moving hidden sector D-brane. Since such matter interacts only very weakly with the standard model particles, this scenario can provide a natural origin for the dark sector of th...

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Published in: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa21633
first_indexed 2015-05-21T16:38:41Z
last_indexed 2019-08-09T15:03:47Z
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spelling 2019-08-08T10:49:12.6744785 v2 21633 2015-05-21 Dark D-brane cosmology 2fb8d4bb665e9a89d3b3478c17f646f8 0000-0002-5589-9928 Ivonne Zavala Carrasco Ivonne Zavala Carrasco true false 2015-05-21 BGPS Disformally coupled cosmologies arise from Dirac-Born-Infeld actions in Type II string theories, when matter resides on a moving hidden sector D-brane. Since such matter interacts only very weakly with the standard model particles, this scenario can provide a natural origin for the dark sector of the universe with a clear geometrical interpretation: dark energy is identified with the scalar field associated to the D-brane's position as it moves in the internal space, acting as quintessence, while dark matter is identified with the matter living on the D-brane, which can be modelled by a perfect fluid. The coupling functions are determined by the (warped) extra-dimensional geometry, and are thus constrained by the theory. The resulting cosmologies are studied using both dynamical system analysis and numerics. From the dynamical system point of view, one free parameter controls the cosmological dynamics, given by the ratio of the warp factor and the potential energy scales. The disformal coupling allows for new scaling solutions that can describe accelerating cosmologies alleviating the coincidence problem of dark energy. In addition, this scenario may ameliorate the fine-tuning problem of dark energy, whose small value may be attained dynamically, without requiring the mass of the dark energy field to be unnaturally low. Journal Article Journal of Cosmology and Astroparticle Physics 2014 06 036 036 1475-7516 16 6 2014 2014-06-16 10.1088/1475-7516/2014/06/036 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University SCOAP3 2019-08-08T10:49:12.6744785 2015-05-21T16:45:13.3455240 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Tomi Koivisto 1 Danielle Wills 2 Ivonne Zavala 3 Ivonne Zavala Carrasco 0000-0002-5589-9928 4 0021633-65201660441PM.pdf KWZ.pdf 2016-06-05T18:04:41.1200000 Output 2826447 application/pdf Version of Record true 2016-05-06T00:00:00.0000000 Article funded by SCOAP 3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License true
title Dark D-brane cosmology
spellingShingle Dark D-brane cosmology
Ivonne Zavala Carrasco
title_short Dark D-brane cosmology
title_full Dark D-brane cosmology
title_fullStr Dark D-brane cosmology
title_full_unstemmed Dark D-brane cosmology
title_sort Dark D-brane cosmology
author_id_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8
author_id_fullname_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8_***_Ivonne Zavala Carrasco
author Ivonne Zavala Carrasco
author2 Tomi Koivisto
Danielle Wills
Ivonne Zavala
Ivonne Zavala Carrasco
format Journal article
container_title Journal of Cosmology and Astroparticle Physics
container_volume 2014
container_issue 06
container_start_page 036
publishDate 2014
institution Swansea University
issn 1475-7516
doi_str_mv 10.1088/1475-7516/2014/06/036
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 Disformally coupled cosmologies arise from Dirac-Born-Infeld actions in Type II string theories, when matter resides on a moving hidden sector D-brane. Since such matter interacts only very weakly with the standard model particles, this scenario can provide a natural origin for the dark sector of the universe with a clear geometrical interpretation: dark energy is identified with the scalar field associated to the D-brane's position as it moves in the internal space, acting as quintessence, while dark matter is identified with the matter living on the D-brane, which can be modelled by a perfect fluid. The coupling functions are determined by the (warped) extra-dimensional geometry, and are thus constrained by the theory. The resulting cosmologies are studied using both dynamical system analysis and numerics. From the dynamical system point of view, one free parameter controls the cosmological dynamics, given by the ratio of the warp factor and the potential energy scales. The disformal coupling allows for new scaling solutions that can describe accelerating cosmologies alleviating the coincidence problem of dark energy. In addition, this scenario may ameliorate the fine-tuning problem of dark energy, whose small value may be attained dynamically, without requiring the mass of the dark energy field to be unnaturally low.
published_date 2014-06-16T18:41:50Z
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score 11.04748

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