Shadow cast and Deflection angle of Kerr-Newman-Kasuya spacetime

TL;DR

This paper investigates the shadow and gravitational lensing effects of a Kerr-Newman-Kasuya black hole, revealing how its dyon charge influences the shadow size and deflection angle.

Contribution

It introduces the analysis of shadow and lensing for the Kerr-Newman-Kasuya black hole, highlighting the impact of dyon charge on observable phenomena.

Findings

Dyon charge reduces the black hole's shadow size.

Dyon charge decreases the gravitational deflection angle.

Black hole spin and charge jointly affect shadow shape.

Abstract

We study the shadow cast or silhouette generated by a Kerr-Newman-Kasuya (KNK) spacetime (rotating dyon black hole). It is shown that in addition to the angular momentum of the black hole, the dyon charge also affects the shadow image of the KNK black hole. Moreover, we analyze the weak gravitational lensing by the KNK black hole by using the Gauss-Bonnet theorem. Finally, we find that extra dyon charge decreases both the deflection angle and shadow of the KNK black hole.