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Manifestation of a nontrivial vacuum in discrete light-cone quantization
1Department of Physics, Nagoya University, Chikusa, Nagoya 464-8602, Japan.
Physical Review Letters
|January 22, 2002
Abstract:
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.