The Physical Meaning of Gauge Transformations in Electrodynamics

Details The Physical Meaning of Gauge Transformations in Electrodynamics The Physical Meaning of Gauge Transformations in Electrodynamics

2006-11-15

arxiv.org/abs/physics/0611148v1

Physics

General Physics

10 pages, no figure

Scientific paper

The structure of classical electrodynamics based on the variational principle together with causality and space-time homogeneity is analyzed. It is proved that in this case the 4-potentials are defined uniquely. On the other hand, the approach where Maxwell equations and the Lorentz law of force are regarded as cornerstones of the theory allows gauge transformations. For this reason, the two theories are {\em not equivalent}. A simple example substantiates this conclusion. Quantum physics is linked to the variational principle and it is proved that the same result holds for it. The compatibility of this result with the gauge invariance of the Lagrangian density is explained.

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