Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

# Weak Gravitational Lensing by Stringy Black Holes

Version 1 : Received: 1 December 2019 / Approved: 4 December 2019 / Online: 4 December 2019 (10:12:06 CET)

A peer-reviewed article of this Preprint also exists.

Journal reference: The European Physical Journal Plus 2020, 135
DOI: 10.1140/epjp/s13360-020-00322-x

## Abstract

In this paper, we discuss the weak gravitational lensing in the context of stringy black holes. Initially, we examine the deflection angle of photon by charged stringy black hole. For this desire, we compute the Gaussian optical curvature and implement the Gauss-Bonnet theorem to investigate the deflection angle for spherically balanced spacetime of stringy black hole. We also analyze the influence of plasma medium in the weak gravitational lensing for stringy black hole. Moreover, the graphical impact of coupling constant $\alpha$, impact parameter $b$ , black hole charge $Q$ on deflection angle by charged stringy black hole has been studied in plasma as well as non-plasma medium.

## Subject Areas

Weak gravitational lensing; Stringy black hole; Deflection angle; Gauss-Bonnet theorem

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