Motion of spinning test bodies in Kerr spacetime
  We investigate the motion of spinning test bodies in General Relativity. By means of a multipolar approximation method for extended test bodies we derive the equations of motion, and classify the orbital motion of pole-dipole test bodies in the equatorial plane of the Kerr geometry. An exact expression for the periastron shift of a spinning test body is given. Implications of test body spin corrections are studied and compared with the results obtained by means of other approximation schemes. 
Eva Hackmann, Claus L\"ammerzahl, Yuri N. Obukhov, Dirk Puetzfeld,   Isabell Schaffer
gr-qc