Motion of Charged Particles around a Weakly Magnetized Rotating Black   Hole
  We study the motion of a charged particle around a weakly magnetized rotating black hole. We classify the fate of a charged particle kicked out from the innermost stable circular orbit. We find that the final fate of the charged particle depends mostly on the energy of the particle and the radius of the orbit. The energy and the radius in turn depend on the initial velocity, the black hole spin, and the magnitude of the magnetic field. We also find possible evidence for the existence of bound motion in the vicinity of the equatorial plane. 
Ryo Shiose, Masashi Kimura, Takeshi Chiba
gr-qc astro-ph.HE