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Nonperturbative calculation of symmetry breaking in quantum field theory
Phys. Rev. D 55, R3255(R) – Published 15 March, 1997
DOI: https://doi.org/10.1103/PhysRevD.55.R3255
Abstract
A new version of the δ expansion is presented, which, unlike the conventional δ 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 , where is a measure of the degree of nonlinearity in the interaction term.
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