Gravitational lensing by a charged black hole of string theory

TL;DR

This paper investigates gravitational lensing effects caused by a charged black hole from string theory, analyzing image positions and magnifications, and finds no significant string effects in strong gravity lensing observables.

Contribution

It provides a detailed analysis of lensing by GMGHS black holes and estimates strong-lensing parameters for a supermassive galactic object, highlighting the absence of notable string effects.

Findings

No significant string effects in strong-lensing observables.

Estimated strong-lensing parameters for a supermassive black hole.

Analyzed relativistic image positions and magnifications.

Abstract

We study gravitational lensing by the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) charged black hole of heterotic string theory and obtain the angular position and magnification of the relativistic images. Modeling the supermassive central object of the galaxy as a GMGHS black hole, we estimate the numerical values of different strong-lensing parameters. We find that there is no significant string effect present in the lensing observables in the strong-gravity scenario.