Construction of non-trivial relativistic quantum fields in arbitrary space-time dimension via superposition of free fields
We construct Schwinger functions as the superposition of Schwinger functions which correspond to those of free fields with sharp masses $ m $. We prove that all axioms of Osterwalder and Schrader are satisfied. This construction works independently of the space-time dimension $ d $. The Schwinger functions under consideration are the moments of a non-Gaussian measure on the space of tempered distributions $ S'(\mathbb R^d) $.