Periodic vacuum and particles in two dimensions

Details Periodic vacuum and particles in two dimensions Periodic vacuum and particles in two dimensions

1999-03-11

arxiv.org/abs/hep-lat/9903020v2

Phys.Rev. D61 (2000) 065008

Physics

High Energy Physics

High Energy Physics - Lattice

Final version, additional references and the proof of reflection positivity added, 41 pages, 16 figures

Scientific paper

10.1103/PhysRevD.61.065008

Different dynamical symmetry breaking patterns are explored for the two dimensional phi4 model with higher order derivative terms. The one-loop saddle point expansion predicts a rather involved phase structure and a new Gaussian critical line. This vacuum structure is corroborated by the Monte Carlo method, as well. Analogies with the structure of solids, the density wave phases and the effects of the quenched impurities are mentioned. The unitarity of the time evolution operator in real time is established by means of the reflection positivity.

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