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Dynamical sectors for a spinning particle in AdS_3
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We consider the dynamics of the motion of a particle of mass M and spin J in AdS_3. The study reveals the presence of different dynamical sectors depending on the relative values of M, J and the AdS_3 radius R. For the subcritical M^2 R^2-J^2 >0 and supercritical M^2 R^2-J^2<0 cases, it is seen that the equations of motion give the geodesics of AdS_3. For the critical case M^2R^2=J^2 there exist extra gauge transformations which further reduce the physical degrees of freedom, and the motion corresponds to the geodesics of AdS_2. This result should be useful in the holographic interpretation of the entanglement entropy for 2d conformal field theories with gravitational anomalies.
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Massive and massless particles in Mielke--Baekler geometries
In teleparallel Mielke–Baekler (AdS) spacetimes, spinning particle actions split into regular and critical sectors; the critical massive sector obeys a Papapetrou-like spin-curvature equation, and massless conformal N...
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