High Temperature Response Functions and the Non-Abelian Kubo Formula
R. Jackiw, V. P. Nair
Abstract
We describe the relationship between time-ordered and retarded response functions in a plasma. We obtain an expression, including the proper iε-prescription, for the induced current due to hard thermal loops in a non-Abelian theory, thus giving the non-Abelian generalization of the Kubo formula. The result is closely related to the eikonal for a Chern-Simons theory and is relevant for a gauge-invariant description of Landau damping in the quark-gluon plasma at high temperature.
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