Strong deflection lensing by charged black holes in scalar-tensor gravity

TL;DR

This paper investigates how charged black holes in scalar-tensor gravity bend light strongly, deriving deflection angles and image properties, and compares these with classical Reissner-Norstrom black holes to assess observational differences.

Contribution

It provides the first detailed analysis of strong deflection lensing by charged black holes in scalar-tensor gravity, including observational implications.

Findings

Derived deflection angles in the strong deflection limit.

Calculated positions and magnifications of relativistic images.

Compared lensing features with Reissner-Norstrom black holes.

Abstract

We examine a class of charged black holes in scalar-tensor gravity as gravitational lenses. We find the deflection angle in the strong deflection limit, from which we obtain the positions and the magnifications of the relativistic images. We compare our results with those corresponding to the Reissner-Norstrom spacetime and we analyze the observational aspects in the case of the Galactic supermassive black hole.