The Classical Approximation for Real-Time Scalar Field Theory at Finite Temperature

Details The Classical Approximation for Real-Time Scalar Field Theory at Finite Temperature The Classical Approximation for Real-Time Scalar Field Theory at Finite Temperature

1998-09-11

arxiv.org/abs/hep-ph/9809339v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 eps figures, talk presented at the 5th International Workshop on Thermal Field Theories and Their Applications, Reg

Scientific paper

The use of classical thermal field to approximate real-time quantum thermal field theory is discussed. For a \lambda\phi^4 theory, it is shown that the classical Rayleigh-Jeans divergence can be canceled with the appropriate counterterms, and a comparison is made between the classical and quantum perturbative expansion. It is explained why Hard Thermal Loops prevent the same method to work for gauge theories.

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