Nonperturbative calculation of symmetry breaking in quantum field theory
classification
✦ hep-th
keywords
deltafieldexpansionnonperturbativequantumscalarsymmetrytheory
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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.
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