A probe particle in a Kerr-Newman-de Sitter cosmos

Abstract

We consider the force acting on a spinning charged test particle (probe particle) with mass m and charge q in a slowly rotating Kerr-Newman-de Sitter (KNdS) black hole with mass M and charge Q. We consider the case in which the spin vector of the probe particle is parallel to the angular momentum vector of the KNdS spacetime. We take account of the gravitational spin-spin interaction under the slow rotation limit of the KNdS spacetime. When Q = M and q = m, we show that the force balance holds including the spin-spin interaction and the motion is approximately the same as that of a particle in de Sitter spacetime. This force cancellation suggests the possibility of the existence of an exact solution of a spinning multi-KNdS black hole.