Vanishing of longitudinal mode of massive photon as photon mass goes to zero in gage-invariant electrodynamics, is investigated with help of examples; distinction between two forms of gage-invariant amplitudes is made in order to clarify this limit; conditions are obtained so that limiting process is smooth; results on equality of particle charge are obtained which are usually derived by means of Ward's identity.
On massive and massless photons
Nuovo Cimento
Nuovo Cimento ; 32 , n 6
1964
11 pages
Aufsatz (Zeitschrift)
Englisch
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