Strong gravitational lensing --- A probe for extra dimensions and Kalb-Ramond field

TL;DR

This paper investigates strong gravitational lensing in higher-dimensional and Kalb-Ramond field-influenced black hole spacetimes, analyzing observable differences and potential signatures for these exotic models.

Contribution

It develops analytical tools to study gravitational lensing in three novel black hole spacetimes involving extra dimensions and Kalb-Ramond fields, providing detailed observable predictions.

Findings

Behavior of relativistic image positions analyzed

Angular separation and magnitude differences computed

Distinct observational signatures identified

Abstract

Strong field gravitational lensing in the context of both higher spacetime dimensions and in presence of Kalb-Ramond field have been studied. After developing proper analytical tools to analyze the problem we consider gravitational lensing in three distinct black hole spacetimes --- (a) four dimensional black hole in presence of Kalb-Ramond field, (b) brane world black holes with Kalb-Ramond field and finally (c) black hole solution in $f(T)$ gravity. In all the three situations we have depicted the behavior of three observables: the asymptotic position approached by the relativistic images, the angular separation and magnitude difference between the outermost images with others packed inner ones, both numerically and analytically. Difference between these scenarios have also been discussed along with possible observational signatures.