Medley in finite temperature field theory
نویسنده
چکیده
I discuss three subjects in thermal field theory: why in SU(N) gauge theories the Z(N) symmetry is broken at high (instead of low) temperature, the possible singularity structure of gauge variant propagators, and the problem of how to compute the viscosity from the Kubo formula. Based on an invited talk presented at the Workshop on Hot QCD held at the Winnipeg Institute for Theoretical Physics, Winnipeg, July 1992. I take this opportunity to make three comments about field theories at nonzero temperature, especially as applies to hot QCD. The first is trivial; the second, base speculation, and the third, a technical problem. 1. Why the Z(N) symmetry is broken at high temperature Consider an SU(N) gauge theory without dynamical fermions. At nonzero temperature the order parameter for this system is the Polyakov line [1],
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