  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.
