Gravitational Faraday rotation of light propagation in the Kerr-Newman-Taub-NUT space-time

Abstract

We investigate the gravitational Faraday effect in the Kerr-Newman-Taub-NUT space-time under the weak deflection limit. Contrary to previously stated zero net effect when the source and the observer are remote from the black hole, a non-zero Faraday rotation has been found. The rotation angle is dependent on the spin and the mass of the black hole and the observer's angular position, as in the case of the Kerr space-time, with additional contribution of the electrical charge and the NUT charge.