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Transport coefficients from the 2PI effective action: weak coupling and large N analysis
 

Summary: Transport coefficients from the 2PI effective action:
weak coupling and large N analysis
Gert Aarts1 and Jose M. Mart´inez Resco2
1
Department of Physics, University of Wales Swansea
Singleton Park, Swansea, SA2 8PP, United Kingdom
2
Department of Physics & Astronomy, Brandon University
Brandon, Manitoba R7A 6A9, Canada
E-mail: g.aarts@swan.ac.uk, martinezrescoj@brandonu.ca
Abstract. The diagrammatic computation of transport coefficients in relativistic field theories
is discussed. We show that the lowest nontrivial truncation of the two-particle irreducible (2PI)
effective action correctly determines transport coefficients in a weak coupling or 1/N expansion
at leading (logarithmic) order. In gauge theories, we verify gauge fixing independence and
consistency with the Ward identity. These results support the applicability of 2PI effective
action techniques to the study of nonequilibrium quantum-field dynamics.
1. Introduction
Motivated by the recent developments in heavy ion collisions as well as in inflationary
cosmology, the dynamics of relativistic quantum fields out of equilibrium and their subsequent
thermalization has been studied using various approximations: (inhomogeneous) mean-field

  

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

 

Collections: Physics