Shadow of charged wormholes in Einstein-Maxwell-dilaton theory

TL;DR

This paper investigates the shadows of charged wormholes in Einstein-Maxwell-dilaton theory, analyzing how magnetic and electric charges influence the shadow size, while finding the dilaton charge has no effect.

Contribution

It constructs shadow images of charged wormholes in EMD theory and examines the impact of different charges on the shadow's characteristics.

Findings

Shadow radius increases with magnetic and electric charges.

Dilaton charge does not affect the shadow.

Photon geodesics are evaluated to analyze shadow formation.

Abstract

The study of shadow is quite prominent nowadays because of the ongoing Event Horizon Telescope\footnote{https://eventhorizontelescope.org/} observations. We construct the shadow images of charged wormholes in Einstein-Maxwell-dilaton (EMD) theory. The spacetime metric of the charged wormholes contains three charges: magnetic charge $P$, electric charge $Q$, and dilaton charge $\Sigma$. We evaluate the photon geodesics around the charged wormholes. We also calculate the effective potential and discuss its behavior with angular momentum $L$ and different values of charges $P$, $Q$, and $\Sigma$. A study of the shadow of charged wormholes reveals that the shadow has an effect of the charges $P$ and $Q$. The radius of the shadow increases with the magnetic charge $P$ as well as the electric charge $Q$. We also find that the dilaton charge does not affect the shadow of the charged wormholes.