Purely perturbative Boltzmann equation for hot non-Abelian gauge theories

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  • 非可視ゲージ理論における摂勅論的ボルツマン方程式(熱場の量子論とその応用,研究会報告)

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Abstract

In the perturbation theory, trasnport phenomena in hot non-Abelian gauge theories like QCD axe often plagued with infrared singularities or nonperturbative effects. We show, in the context of the Kadanoff & Baym formalism, that there are certain nonequilibrium processes which are free from such difficulties. For these processes, due to an interplay between the macroscopic and microscopic physics, characteristic time scale (the mesoscale) naturally enters as an infrared cutoff and purely perturbative description by the Boltzmann equation is valid.

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