Journal article 1109 views
Spectral function at high temperature in the classical approximation
Physics Letters B, Volume: "B518", Issue: 3-4, Pages: 315 - 322
Swansea University Author:
Gert Aarts
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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...
| Published in: | Physics Letters B |
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| ISSN: | 03702693 |
| Published: |
2001
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa22613 |
| 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. |
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| 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 |