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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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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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa22613
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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 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.
Item Description: @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: Faculty of Science and Engineering
Issue: 3-4
Start Page: 315
End Page: 322