R. Jackiw et Vp. Nair, HIGH-TEMPERATURE RESPONSE FUNCTIONS AND THE NON-ABELIAN KUBO FORMULA, Physical review. D. Particles and fields, 48(10), 1993, pp. 4991-4998
We describe the relationship between time-ordered and retarded respons
e functions in a plasma. We obtain an expression, including the proper
iepsilon prescription, for the induced current due to hard thermal lo
ops in a non-Abelian theory, thus giving the non-Abelian generalizatio
n of the Kubo formula. The result is closely related to the eikonal fo
r a Chern-Simons theory and is relevant for a gauge-invariant descript
ion of Landau damping in the quark-gluon plasma at high temperature.