# Spin gauge symmetry in the action principle for classical relativistic particles

@article{Steinhoff2015SpinGS, title={Spin gauge symmetry in the action principle for classical relativistic particles}, author={Jan Steinhoff}, journal={arXiv: General Relativity and Quantum Cosmology}, year={2015} }

We suggest that the physically irrelevant choice of a representative worldline of a relativistic spinning particle should correspond to a gauge symmetry in an action approach. Using a canonical formalism in special relativity, we identify a (first-class) spin gauge constraint, which generates a shift of the worldline together with the corresponding transformation of the spin on phase space. An action principle is formulated for which a minimal coupling to fields is straightforward. The…

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