Manifestation of a nontrivial vacuum in discrete light cone quantization

Details Manifestation of a nontrivial vacuum in discrete light cone quantization Manifestation of a nontrivial vacuum in discrete light cone quantization

2001-04-02

arxiv.org/abs/hep-th/0104012v2

Phys.Rev.Lett. 87 (2001) 271601

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, 2 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.87.271601

We study a (1+1)-dimensional $\lambda\phi^4$ model with a light-cone zero mode and constant external source to describe spontaneous symmetry breaking. In the broken phase, we find degenerate vacua and discuss their stability based on effective-potential analysis. The vacuum triviality is spurious in the broken phase because these states have lower energy than Fock vacuum. Our results are based on the variational principle.

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