Relativistic Motion of Spinning Particles in a Gravitational Field
  The relative motion of a classical relativistic spinning test particle is studied with respect to a nearby free test particle in the gravitational field of a rotating source. The effects of the spin-curvature coupling force are elucidated and the implications of the results for the motion of rotating plasma clumps in astrophysical jets are discussed. 
C. Chicone, B. Mashhoon and B. Punsly