Summary
The reasons against adopting the Lorentz condition as an operator equation are not serions enough to justify the usual devices for avoiding this. Therefore, electrodynamics has its best foundation in the Landau gauge, in which also the photon propagator is simplest.
Riassunto
Le ragioni contro l’adozione della condizione di Lorentz come una equazione agli operatori non sono abbastanza serie da giustificare i metodi usati per evitarla. PerciÒ, l’elettrodinamica ha le sue più solide basi nel gauge di Landau, in oui inoltre il propagatore fotonico è il più semplice.
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Work performed under the auspices of the U. S. Atomic Energy Commission.
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Just, K. The lorentz condition in quantum theory. Nuovo Cim 38, 400–409 (1965). https://doi.org/10.1007/BF02750468
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DOI: https://doi.org/10.1007/BF02750468