2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53657Canonical quantisation gives a new and convenient finite-temperature perturbation theory in covariant gauges, and solves the problem of the zero-frequency mode in the temporal gauge. [Talk at Workshop on Thermal Field Theories and their Applications, Banff, August 1993]7 pages including one figure in pictex, DAMTP 93-55High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext