Nonperturbative calculation of symmetry breaking in quantum field theory
arXiv:hep-th/9608048 · doi:10.1103/PhysRevD.55.3255
Abstract
A new version of the delta expansion is presented, which, unlike the conventional delta expansion, can be used to do nonperturbative calculations in a self-interacting scalar quantum field theory having broken symmetry. We calculate the expectation value of the scalar field to first order in delta, where delta is a measure of the degree of nonlinearity in the interaction term.
arXiv comment12 pages, no figures, REVTeX