Gravitomagnetism in the Kerr-Newman-Taub-NUT spacetime

TL;DR

This paper investigates how the gravitomagnetic monopole moment in Kerr-Newman-Taub-NUT spacetime affects test particle motion and electromagnetic wave propagation, revealing unique gravitational and polarization effects.

Contribution

It provides a linear approximation analysis of gravitomagnetic effects on gravitational time delay and polarization rotation, and examines modifications to particle orbits due to the monopole.

Findings

Gravitomagnetic monopole contributes to gravitational time delay.

Electromagnetic wave polarization is rotated by the monopole.

Orbit structures are altered in the presence of the gravitomagnetic monopole.

Abstract

We study the motion of test particles and electromagnetic waves in the Kerr-Newman-Taub-NUT spacetime in order to elucidate some of the effects associated with the gravitomagnetic monopole moment of the source. In particular, we determine in the linear approximation the contribution of this monopole to the gravitational time delay and the rotation of the plane of the polarization of electromagnetic waves. Moreover, we consider "spherical" orbits of uncharged test particles in the Kerr-Taub-NUT spacetime and discuss the modification of the Wilkins orbits due to the presence of the gravitomagnetic monopole.