Quantum dynamics of Phi**4 field theory beyond leading order in 1+1 dimensions

Details Quantum dynamics of Phi**4 field theory beyond leading order in 1+1 dimensions Quantum dynamics of Phi**4 field theory beyond leading order in 1+1 dimensions

2003-05-20

arxiv.org/abs/hep-ph/0305220v1

Phys.Rev. D68 (2003) 127702

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 8 encapsulated postscript figures

Scientific paper

10.1103/PhysRevD.68.127702

We consider the out-of-equilibrium evolution of a classical condensate field $\phi=<\Phi>$ and its quantum fluctuations for a $\Phi^4$ 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 (BVA) and in the two-particle irreducible next-to-leading order large-N (2PI-1/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.

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