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Free keywords:
General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Theory, hep-th
Abstract:
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 electromagnetic interaction of a
monopole-dipole particle is constructed explicitly.
