Gravitational lensing of the wormhole in the Eddington-inspired Born-Infeld spacetime with a cosmic string

TL;DR

This paper investigates how a cosmic string influences gravitational lensing effects around an EiBI wormhole, revealing enhanced light deflection and observable differences in image magnification and separation.

Contribution

It introduces the study of cosmic string effects on wormhole lensing within EiBI spacetime, highlighting their impact on observable lensing features.

Findings

Cosmic string enhances light deflection in strong field limit.

Presence of cosmic string affects image separation and brightness.

Observable differences in lensing signatures compared to wormholes without cosmic strings.

Abstract

In this work we study gravitational lensing of the wormhole in the Eddington-inspired Born-Infeld (EiBI) spacetime that incorporates with a cosmic string. It was found that the presence of cosmic string can enhance the light deflection in strong field limit, compared to the case of the Eills-Bronnikov wormhole. The magnification effects of this composite structure could cause some substantial impacts on the angle separation between the first and the rest of the images, and their relative brightness. Furthermore, based on these observables, we model some observable aspects in the strong and the weak field limits. The presence of a cosmic string can affect some distinguishable observables compared to the wormhole without cosmic string. This work could deepen our understanding of the spacetime structure of the wormhole in EiBI spacetime with one-dimensional topological defects.