Summary
The use of the asymptotic condition in electrodynamics is criticized and an alternative approach suggested which utilizes specific properties of the radiation-gauge Green’s functions. This technique is based upon the introduction of a nonlocal field operator which has the property of asymptotically creating physical electrons without the usual emission of soft quanta. It is shown by means of an example how a cross-section may be calculated without either the appearance of spurious infrared divergences or the improper imposition of an asymptotic condition.
Riassunto
Si oritica l’uso della condizione asintotica in elettrodinamica e si suggerisce un altro accostamento che utilizza le proprietà specifiche delle funzioni di Green del gauge di radiazione. Questa teonica è basata sull’introduzione di un operatore di campo non locale che ha la proprietà di creare asintoticamente elettroni fisici senza la solita emissione di quanti molli. Con un esempio si mostra come si puÒ calcolare una sezione d’urto senza che compaiono divergenze infrarosse spurie o senza imporre impropriamente una condizione asintotioa.
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This work is supported in part through funds provided by the Atomic Energy Commission under contract AT(30-l)-2098.
Based upon a thesis submitted to the Physics Department of the Massachusetts Institute of Technology in partial fulfillment of the requirements for the Degree of Doctor of Philosophy.
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Hagen, C.R. Radiation-gauge electrodynamics. Nuovo Cim 28, 970–981 (1963). https://doi.org/10.1007/BF02782026
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DOI: https://doi.org/10.1007/BF02782026