Abstract.
The treatment of fields as operator-valued distributions (OPVD) is recalled with the emphasis on the importance of causality following the work of Epstein and Glaser. Gauge-invariant theories demand the extension of the usual translation operation on OPVD, thereby leading to a generalized QED formulation. At D = 2 the solvability of the Schwinger model is totally preserved. At D = 4 the paracompactness property of the Euclidean manifold permits the use of test functions which are a decomposition of unity and thereby provides a natural justification and extension of the non-perturbative heat kernel method (Fujikawa) for Abelian anomalies. On the Minkowski manifold the specific role of causality in the restauration of gauge invariance (and mass generation for QED2 is exemplified in a simple way.
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Grangé, P., Werner, E. QED Fermi Fields as Operator-Valued Distributions and Anomalies. Few-Body Systems 36, 103–109 (2005). https://doi.org/10.1007/s00601-004-0085-8
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DOI: https://doi.org/10.1007/s00601-004-0085-8