Manifestation of a nontrivial vacuum in discrete light cone quantization

Abstract

We study a (1+1)-dimensional $\lambda {\varphi }^4$ 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.

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

Cited by in corpus (5)

• Density matrix renormalization group in a two-dimensional $\lambda {\varphi }^4$ Hamiltonian lattice model
• Kinks in Discrete Light Cone Quantization
• Matrix product representation of gauge invariant states in a Z_2 lattice gauge theory
• Spontaneous symmetry breaking in light front field theory
• Density matrix renormalization group approach to a two-dimensional bosonic model