Henning, Peter A.; Graf, Martin; Matthäus, Frank - In: Physica A: Statistical Mechanics and its Applications 182 (1992) 3, pp. 489-508
We introduce a new concept for thermal quantum theories, which expresses a time dependent quasi-particle picture as the coupling to an external (classical) gauge field. The non-Abelian nature of this field even for quasi-free systems can lead to renormalization factors that depend on the...