Abstract
We consider the out-of-equilibrium evolution of a classical condensate field and its quantum fluctuations for a model in dimensions with a double well potential. We use the two-particle point-irreducible (2PPI) formalism in the two-loop approximation. We compare our results to those obtained in the Hartree approximation, in the bare vertex approximation, and in the two-particle irreducible next-to-leading order large- approach, with thermal initial conditions. In the 2PPI scheme, we find that the system tends to the symmetric configuration at late times, as expected in the absence of spontaneous symmetry breaking.
- Received 20 May 2003
DOI:https://doi.org/10.1103/PhysRevD.68.127702
©2003 American Physical Society