Summary
In the framework of the causal approach to QED, interacting fields are introduced by functional differentiation of theS-matrix. The properties of these field operators are studied in detail. It is shown that appropriately defined quantum versions of the Dirac and wave equations hold true. As a by-product, the correct operator products for QED are obtained.
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Dütsch, M., Krahe, F. & Scharf, G. Interacting fields in finite QED. Nuov Cim A 103, 871–901 (1990). https://doi.org/10.1007/BF02799234
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DOI: https://doi.org/10.1007/BF02799234