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Particle creation and warm inflation

Gert Aarts Orcid Logo, Anders Tranberg

Physics Letters B, Volume: "B650", Issue: 1, Pages: 65 - 71

Swansea University Author: Gert Aarts Orcid Logo

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DOI (Published version): 10.1016/j.physletb.2007.04.055

Abstract

During cosmological inflation, it has been suggested that fields coupled to the inflaton can be excited by the slow-rolling inflaton into a quasi-stable non-vacuum state. Within this scenario of ``warm inflation'', this could allow for a smooth transition to a radiation dominated Universe...

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Published in: Physics Letters B
ISSN: 03702693
Published: 2007
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URI: https://cronfa.swan.ac.uk/Record/cronfa22589
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spelling 2015-07-21T11:29:13.8298016 v2 22589 2015-07-21 Particle creation and warm inflation 1ba0dad382dfe18348ec32fc65f3f3de 0000-0002-6038-3782 Gert Aarts Gert Aarts true false 2015-07-21 BGPS During cosmological inflation, it has been suggested that fields coupled to the inflaton can be excited by the slow-rolling inflaton into a quasi-stable non-vacuum state. Within this scenario of ``warm inflation'', this could allow for a smooth transition to a radiation dominated Universe without a separate reheating stage and a modification of the slow roll evolution, as the heat-bath backreacts on the inflaton through friction. In order to study this from first principles, we investigate the dynamics of a scalar field coupled to the inflaton and N light scalar boson fields, using the 2PI-1/N expansion for nonequilibrium quantum fields. As a first step we restrict ourselves to Minkowski spacetime, interpret the inflaton as a time-dependent background, and use vacuum initial conditions. We find that the dominant effect is particle creation at late stages of the evolution due to the effective time-dependent mass. The further transfer of energy to the light degrees of freedom and subsequent equilibration only occurs after the end of inflation. As a consequence, the adiabatic constraint, which is assumed in most studies of warm inflation, is not satisfied when starting from an initial vacuum state. Journal Article Physics Letters B "B650" 1 65 71 03702693 31 1 2007 2007-01-31 10.1016/j.physletb.2007.04.055 http://inspirehep.net/record/743065 @articleAarts:2007qu, author = "Aarts, Gert and Tranberg, Anders", title = "Particle creation and warm inflation", journal = "Phys.Lett.", volume = "B650", pages = "65-71", doi = "10.1016/j.physletb.2007.04.055", year = "2007", eprint = "hep-ph/0701205", archivePrefix = "arXiv", primaryClass = "hep-ph", reportNumber = "DAMTP-2007-7, SWAT-07-999", SLACcitation = "%%CITATION = HEP-PH/0701205;%%", COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2015-07-21T11:29:13.8298016 2015-07-21T10:14:51.9599383 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gert Aarts 0000-0002-6038-3782 1 Anders Tranberg 2
title Particle creation and warm inflation
spellingShingle Particle creation and warm inflation
Gert Aarts
title_short Particle creation and warm inflation
title_full Particle creation and warm inflation
title_fullStr Particle creation and warm inflation
title_full_unstemmed Particle creation and warm inflation
title_sort Particle creation and warm inflation
author_id_str_mv 1ba0dad382dfe18348ec32fc65f3f3de
author_id_fullname_str_mv 1ba0dad382dfe18348ec32fc65f3f3de_***_Gert Aarts
author Gert Aarts
author2 Gert Aarts
Anders Tranberg
format Journal article
container_title Physics Letters B
container_volume "B650"
container_issue 1
container_start_page 65
publishDate 2007
institution Swansea University
issn 03702693
doi_str_mv 10.1016/j.physletb.2007.04.055
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
url http://inspirehep.net/record/743065
document_store_str 0
active_str 0
description During cosmological inflation, it has been suggested that fields coupled to the inflaton can be excited by the slow-rolling inflaton into a quasi-stable non-vacuum state. Within this scenario of ``warm inflation'', this could allow for a smooth transition to a radiation dominated Universe without a separate reheating stage and a modification of the slow roll evolution, as the heat-bath backreacts on the inflaton through friction. In order to study this from first principles, we investigate the dynamics of a scalar field coupled to the inflaton and N light scalar boson fields, using the 2PI-1/N expansion for nonequilibrium quantum fields. As a first step we restrict ourselves to Minkowski spacetime, interpret the inflaton as a time-dependent background, and use vacuum initial conditions. We find that the dominant effect is particle creation at late stages of the evolution due to the effective time-dependent mass. The further transfer of energy to the light degrees of freedom and subsequent equilibration only occurs after the end of inflation. As a consequence, the adiabatic constraint, which is assumed in most studies of warm inflation, is not satisfied when starting from an initial vacuum state.
published_date 2007-01-31T06:39:18Z
_version_ 1829536486962233344
score 11.05816

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