Gravitational lensing in 4-D Einstein-Gauss-Bonnet gravity in the presence of plasma

TL;DR

This paper investigates gravitational lensing effects in 4D Einstein-Gauss-Bonnet gravity within a weak-field regime, considering different plasma distributions and comparing results with Schwarzschild geometry.

Contribution

It introduces a detailed analysis of lensing angles and magnifications in 4D Einstein-Gauss-Bonnet gravity for various plasma environments, extending prior models.

Findings

Lensing angles depend on plasma distribution and gravity modifications.

Magnification effects vary with plasma type and gravitational parameters.

Results contrast with classical Schwarzschild lensing predictions.

Abstract

In this paper we have assumed a weak-field regime to explore the gravitational lensed photons in a 4 dimensional Einstein-Gauss-Bonnet gravity, which is very much in the limelight these days. The investigation is conducted in three distinct paradigms: uniform plasma, singular isothermal sphere and a non-singular isothermal sphere. The lensing angle associated with the distribution factor of the medium is individually derived for each case and further utilized to study the magnification of the image source brightness, selectively for the uniform plasma and singular isothermal sphere. The attained results are brought forth in contrast with the standard Schwarzschild geometry