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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.
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Bender et al. (1997) studied this question.
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