Motion Of Spinning Test Particle In Black Hole Backgrounds

The motion of a test particle in a curved spacetime is controlled by the properties of the background spacetime,therefore one can use the motion of the test particle to understand the geometry properties of the background spacetime.A point-like particle is the most simple approach to describe a test particle,the corresponding equation of motion will be described by the geodesics if we ignore the test particle's inner structure and the back-reaction on the spacetime.Note that,a true particle should have inner structure and the contribution from such inner structure should be considered when the test particle locating in the strong gravity background.When the contributions of the inner structure are considered,the geodesic equations will not work well anymore,and the equation of motion for the particle with inner structure should be adopted.In this thesis,we will investigate the motion of the spinning test particle in various black hole backgrounds.To investigate the motion of a test particle with inner structure,one can use the multi-pole expansion method.For example,we only need to consider the dipole effect for a spinning test particle.We first introduce how to use the multi-pole expansion method to derive the equation of the motion(Mathisson-Papapetrou-Dixon equation)for the spinning test particle,and give the corresponding covariant form.By comparing the Mathisson-Papapetrou-Dixon equation and the geodesic equation,all the results that based on the geodesics should be modified.Next,we investigate the Kerr-Newman black holes as the spinning particle accelerators and show how the center-mass energy is affected by the particle spin.The Innermost Stable Circular Orbit of the spinning teat particle in Kerr-Newman black hole background is still investigated,and we find that the non-vanishing particle spin can reduce the radius of the Innermost Stable Circular Orbit.After showing the effects of particle spin on the center-mass energy and Innermost Stable Circular Orbit,we also estimate the motion deviation induced by the particle spin and the non-vanishing cosmological constant.Finally,we investigate the motion of the spinning test particle in the novel 4- EinsteinGauss-Bonnet black hole and find some new results that are not predicted by the general relativity.