Nonequilibrium dynamics of the O(N) linear sigma model
Abstract
Description
We investigate the out-of-equilibrium evolution of a classical background field and its quantum fluctuations in the scalar O(N) model with spontaneous symmetry breaking. We consider the 2-loop 2PI effective action in the Hartree approximation, i.e., including bubble resummation but without non-local contributions to the Dyson-Schwinger equation. We concentrate on the (nonequilibrium) phase structure of the model and observe a first-order transition between a spontaneously broken and a symmetric phase at low and high energy densities, respectively. So typical structures expected in thermal equilibrium are encountered in nonequilibrium dynamics even at early times before thermalization.
Based on an article published in Phys.Rev.D65, 065019 (2002) written in collaboration with Jurgen Baacke. Presented at International Workshop on Strong and Electroweak Matter (SEWM 2002), Heidelberg, Germany, 2-5 Oct 2002
Based on an article published in Phys.Rev.D65, 065019 (2002) written in collaboration with Jurgen Baacke. Presented at International Workshop on Strong and Electroweak Matter (SEWM 2002), Heidelberg, Germany, 2-5 Oct 2002