Quantum dynamics of Φ4 field theory beyond leading order in 1+1 dimensions

Jürgen Baacke and Andreas Heinen
Phys. Rev. D 68, 127702 – Published 23 December 2003
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Abstract

We consider the out-of-equilibrium evolution of a classical condensate field φ=Φ and its quantum fluctuations for a Φ4 model in 1+1 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-N 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

Authors & Affiliations

Jürgen Baacke* and Andreas Heinen

  • Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany

  • *Electronic address: baacke@physik.uni-dortmund.de
  • Electronic address: andreas.heinen@uni-dortmund.de

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Issue

Vol. 68, Iss. 12 — 15 December 2003

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