Spectral function at high temperature in the classical approximation
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Publication:5944254
DOI10.1016/S0370-2693(01)01081-4zbMATH Open0970.81083arXivhep-ph/0108125OpenAlexW3099258934MaRDI QIDQ5944254
Author name not available (Why is that?)
Publication date: 4 October 2001
Published in: (Search for Journal in Brave)
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.
Full work available at URL: https://arxiv.org/abs/hep-ph/0108125
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