Abstract
By the use of the real-time formalism of field theory at finite temperature we carry out the one-loop off-shell calculation for massless non-Abelian gauge theories at finite temperature in the general covariant gauge, and study the properties of the temperature- and gauge-dependent couplings, a(..mu..,xiequivalentT/..mu..;..cap alpha..). The effects of temperature manifest themselves as a powerlike behavior of the inverse of the coupling a/sup -1/(..mu..,xi;..cap alpha..) on the parameter xi = T/..mu.., in sharp contrast to the logarithmic dependence on the momentum ..mu... The strong vertex dependence of the coupling is shown to come out irrespective of any choice of the gauge parameter ..cap alpha.. within the covariant gauge, and thus may invalidate the perturbative treatment of gauge theory at finite (especially at high) temperature.
Published Version
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