Relativistic quantum mechanics and local gauge symmetry

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Abstract
The requirement that (either Abelian or non‐Abelian) local symmetry transformations be globally and unitarily implementable kinematical symmetries of relativistic systems implies the emergence of a dynamical group which has been suggested in earlier studies. The group leads to a 4‐velocity operator and to the Newton‐Wigner position operator. Demanding gauge invariance of localization determines a unique interaction structure. Superselection rules for the gauge charges arise.