Summary: arXiv:hep­ph/0409090
v1
8
Sep
2004
August 18, 2005 9:59 Proceedings Trim Size: 9in x 6in aartsresco
TRANSPORT COEFFICIENTS AND THE 2PI EFFECTIVE
ACTION IN THE LARGE N LIMIT 
GERT AARTS AND JOSE M. MARTINEZ RESCO
Department of Physics, The Ohio State University
174 West 18th Avenue, Columbus, OH 43210, USA
aarts@mps.ohio-state.edu, marej@mps.ohio-state.edu
We discuss the computation of transport coeÆcients in large N f QCD and the
O(N) model for massive particles. The calculation is organized using the 1=N
expansion of the 2PI eective action to next-to-leading order. For the gauge theory,
we verify gauge xing independence and consistency with the Ward identity. In
the gauge theory, we nd a nontrivial dependence on the fermion mass.
1. Motivation
In understanding the evolution of quantum elds out of equilibrium, ther-
malization plays an important role. For long enough times, the dynamics of

Source: Aarts, Gert - Department of Physics, University of Wales Swansea

Collections: Physics