Sugihara T, Taniguchi M. Manifestation of a nontrivial vacuum in discrete light-cone quantization.
Phys Rev Lett 2001;
87:271601. [PMID:
11800871 DOI:
10.1103/physrevlett.87.271601]
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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.
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