Abstract
Using covariant derivatives and the operator definitions of quantum mechanics, gauge invariant Proca and Lehnert equations are derived and the Lorenz condition is eliminated in U(1) invariant electrodynamics. It is shown that the structure of the gauge invariant Lehnert equation is the same in an O(3) invariant theory of electrodynamics.
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Anastasovski, P.K., Bearden, T.E., Ciubotariu, C. et al. Operator Derivation of the Gauge-Invariant Proca and Lehnert Equations; Elimination of the Lorenz Condition. Foundations of Physics 30, 1123–1129 (2000). https://doi.org/10.1023/A:1003608721569
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DOI: https://doi.org/10.1023/A:1003608721569