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Spectral function at high temperature in the classical approximation

Gert Aarts Orcid Logo

Physics Letters B, Volume: "B518", Issue: 3-4, Pages: 315 - 322

Swansea University Author: Gert Aarts Orcid Logo

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DOI (Published version): 10.1016/S0370-2693(01)01081-4

Abstract

At high temperature the infrared modes of a weakly coupled quantum field theory can be treated nonperturbatively in real time using the classical field approximation. We use this to introduce a nonperturbative approach to the calculation of finite-temperature spectral functions, employing the classi...

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Published in: Physics Letters B
ISSN: 03702693
Published: 2001
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URI: https://cronfa.swan.ac.uk/Record/cronfa22613
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first_indexed 2015-07-21T11:25:50Z
last_indexed 2018-02-09T05:00:57Z
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spelling 2015-07-21T11:29:13.8298016 v2 22613 2015-07-21 Spectral function at high temperature in the classical approximation 1ba0dad382dfe18348ec32fc65f3f3de 0000-0002-6038-3782 Gert Aarts Gert Aarts true false 2015-07-21 SPH At high temperature the infrared modes of a weakly coupled quantum field theory can be treated nonperturbatively in real time using the classical field approximation. We use this to introduce a nonperturbative approach to the calculation of finite-temperature spectral functions, employing the classical KMS condition in real time. The method is illustrated for the one-particle spectral function in a scalar field theory in 2+1 dimensions. The result is compared with resummed two-loop perturbation theory and both the plasmon mass and width are found to agree with the analytical prediction. Journal Article Physics Letters B "B518" 3-4 315 322 03702693 31 8 2001 2001-08-31 10.1016/S0370-2693(01)01081-4 http://inspirehep.net/record/561543 @articleAarts:2001yx, author = "Aarts, Gert", title = "Spectral function at high temperature in the classical approximation", journal = "Phys.Lett.", volume = "B518", pages = "315-322", doi = "10.1016/S0370-2693(01)01081-4", year = "2001", eprint = "hep-ph/0108125", archivePrefix = "arXiv", primaryClass = "hep-ph", reportNumber = "HD-THEP-01-33", SLACcitation = "%%CITATION = HEP-PH/0108125;%%", COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2015-07-21T11:29:13.8298016 2015-07-21T10:15:08.5896449 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gert Aarts 0000-0002-6038-3782 1
title Spectral function at high temperature in the classical approximation
spellingShingle Spectral function at high temperature in the classical approximation
Gert Aarts
title_short Spectral function at high temperature in the classical approximation
title_full Spectral function at high temperature in the classical approximation
title_fullStr Spectral function at high temperature in the classical approximation
title_full_unstemmed Spectral function at high temperature in the classical approximation
title_sort Spectral function at high temperature in the classical approximation
author_id_str_mv 1ba0dad382dfe18348ec32fc65f3f3de
author_id_fullname_str_mv 1ba0dad382dfe18348ec32fc65f3f3de_***_Gert Aarts
author Gert Aarts
author2 Gert Aarts
format Journal article
container_title Physics Letters B
container_volume "B518"
container_issue 3-4
container_start_page 315
publishDate 2001
institution Swansea University
issn 03702693
doi_str_mv 10.1016/S0370-2693(01)01081-4
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/561543
document_store_str 0
active_str 0
description At high temperature the infrared modes of a weakly coupled quantum field theory can be treated nonperturbatively in real time using the classical field approximation. We use this to introduce a nonperturbative approach to the calculation of finite-temperature spectral functions, employing the classical KMS condition in real time. The method is illustrated for the one-particle spectral function in a scalar field theory in 2+1 dimensions. The result is compared with resummed two-loop perturbation theory and both the plasmon mass and width are found to agree with the analytical prediction.
published_date 2001-08-31T03:26:47Z
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score 11.013395

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