Non-trivial vacuum structure in light-cone quantum field theory

@article{Heinzl1991NontrivialVS,
  title={Non-trivial vacuum structure in light-cone quantum field theory},
  author={T. Heinzl and S. Krusche and E. Werner},
  journal={Physics Letters B},
  year={1991},
  volume={256},
  pages={55-59}
}
Abstract By modifying the Dirac-Bergmann algorithm for the quantisation of constrained systems we solve the massless Schwinger model quantised on a lightlike hyperplane. We obtain a nontrivial θ-type vacuum which is, cyclic in Fock space.