Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-04-05
Nucl.Phys. B589 (2000) 413-439
Physics
High Energy Physics
High Energy Physics - Theory
27 pages, relation of twistor form of Chern-Simons term to CP^1 model clarified, discussion of relationship with anyons presen
Scientific paper
10.1016/S0550-3213(00)00530-7
The topological nature of Chern-Simons term describing the interaction of a charge with magnetic monopole is manifested in two ways: it changes the plane dynamical geometry of a free particle for the cone dynamical geometry without distorting the free (geodesic) character of the motion, and in the limit of zero charge's mass it describes a spin system. This observation allows us to interpret the charge-monopole system alternatively as a free particle of fixed spin with translational and spin degrees of freedom interacting via the helicity constraint, or as a symmetric spinning top with dynamical moment of inertia and "isospin" U(1) gauge symmetry, or as a system with higher derivatives. The last interpretation is used to get the twistor formulation of the system. We show that the reparametrization and scale invariant monopole Chern-Simons term supplied with the kinetic term of the same invariance gives rise to the alternative description for the spin, which is related to the charge-monopole system in a spherical geometry. The relationship between the charge-monopole system and (2+1)-dimensional anyon is discussed in the light of the obtained results.
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