Phys. Rev. D 55, R3255–R3259 (1997)Nonperturbative calculation of symmetry breaking in quantum field theory
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 δ, where δ is a measure of the degree of nonlinearity in the interaction term. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.55.R3255
DOI:
10.1103/PhysRevD.55.R3255
PACS:
11.10.Lm, 02.30.Mv, 11.10.Kk, 11.30.Er
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