Fuzzy Classical Dynamics as a Paradigm for Emerging Lorentz Geometries

Abstract

We show that the classical equations of motion for a particle on three dimensional fuzzy space and on the fuzzy sphere are underpinned by a natural Lorentz geometry. From this geometric perspective, the equations of motion generally correspond to forced geodesic motion, but for an appropriate choice of noncommutative dynamics, the force is purely noncommutative in origin and the underpinning Lorentz geometry some standard space-time with, in general, non-commutatuve corrections to the metric. For these choices of the noncommutative dynamics the commutative limit therefore corresponds to geodesic motion on this standard space-time. We identify these Lorentz geometries to be a Minkowski metric on R 4 and R × S 2 in the cases of a free particle on three dimensional fuzzy space (R 3 ⋆ ) and the fuzzy sphere (S 2 ⋆ ), respectively. We also demonstrate the equivalence of the on-shell dynamics of S 2 ⋆ and a relativistic charged particle on the commutative sphere coupled to the background magnetic field of a Dirac monopole.