Summary
TheS-matrix for the external field problem of QED contains an undetermined phase. This phase which depends on the external potential is explicitly constructed from the global causality condition. Charge renormalization plays no role in this nonperturbative approach.
Riassunto
La matriceS per il problema del campo esterno di QED contiene una fase non determinata. Questa fase, che dipende dal potenziale esterno, è costruita esplicitamente a partire dalla condizione di causalità globale. La rinormalizzazione di carica non gioca alcun ruolo in questo approccio non perturbativo.
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Supported by FAPSP and Schweizerischer Nationalfonds.
Traduzione a cura della Redazione.
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Scharf, G., Wreszinski, W.F. The causal phase in quantum electrodynamics. Nuov Cim A 93, 1–27 (1986). https://doi.org/10.1007/BF02773438
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DOI: https://doi.org/10.1007/BF02773438