Transport Coefficients at Leading Order: Kinetic Theory versus Diagrams

Details Transport Coefficients at Leading Order: Kinetic Theory versus Diagrams Transport Coefficients at Leading Order: Kinetic Theory versus Diagrams

2002-11-18

arxiv.org/abs/hep-ph/0211281v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 8 figures, to appear in the proceedings of SEWM2002

Scientific paper

I review what is required to compute transport coefficients in ultra-relativistic, weakly coupled gauge theories, at leading order in $g$, using kinetic theory. Then I discuss how the calculation would look in alternative approaches: the 2PI method, and direct diagrammatic analysis. I argue that the 2PI method may be a good way to derive the kinetic theory, but is not very useful directly (in a gauge theory). The diagrammatic approach is almost hopeless.

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