Abstract
On the basis of “thermo field dynamics” allowing the application of the Feynman diagram method to real-time Green's functions at T≠0°K, a field-theoretical formulation of finite-temperature gauge theory is presented. It is an extension of the covariant operator formalism of gauge theory based upon the BRS invariance: The subsidiary condition specifying physical states, the notion of observables, and the structure of the physical subspace at finite temperatures are clarified together with the key formula characterizing the temperature-dependent “vacuum”.
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