Spin Dynamics of Moving Bodies in Rotating Black Hole Spacetimes

The dynamics of spinning test bodies, moving in rotating black hole (Kerr, Bardeen-like and Hayward-like) spacetimes, are investigated. In Kerr spacetime, all the spherical, zoom-whirl unbound orbits considered numerically. Along spherical for high spin, an amplitude modulation is found harmonic evolution spin precessional angular velocity, caused by spin-curvature coupling. discussed orbits, body approaches center so much that it passes through ergosphere. Near inside ergosphere, variation direction can be very rapid. effects coupling also initial values chosen such a way, its move equatorial plane coordinate space comoving frame, respectively. Hence, clear effect observed as orbit vector leave plane. Additional velocity Boyer–Lindquist components considered. Finally, case different regular holes, influences differently evolutions.