Quantum dynamics of Φ4 field theory beyond leading order in 1+1 dimensions -: art. no. 127702

被引:13
作者
Baacke, J [1 ]
Heinen, A [1 ]
机构
[1] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany
关键词
D O I
10.1103/PhysRevD.68.127702
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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, 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.
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页数:4
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