More on the relativistic images produced in gravitational lensing

TL;DR

This paper studies how the electric charge and spin of black holes affect the formation and properties of relativistic images in gravitational lensing, through detailed numerical analysis.

Contribution

It provides a systematic numerical analysis of relativistic images considering black hole charge and spin, extending previous models.

Findings

Deflection angles vary with charge and spin.

Image positions and magnifications depend on black hole parameters.

Time delays between images are quantified for different black hole configurations.

Abstract

We investigate the gravitational lensing properties and the formation of relativistic images associated with black holes modeled by the Reissner-Nordstr\"om and Kerr space-time geometries. In particular, we perform numerical computations of the deflection angles, image angular positions, magnification factors (including demagnification), and time delays between distinct images, and we systematically quantify the dependence of these observables on the electric charge and spin parameters of the black hole.