Plasma lensing and particle dynamics in the vicinity of a Dyonic black hole solution in the context a perfect fluid

Abstract

This article investigates the particle motion properties, and plasma lensing in weak gravitational field around a Dyonic black hole solution in a perfect fluid. We analyze the motion of massive and massless particles by studying the effective potential, energy, and angular momentum as a function of electric and magnetic charge, the fluid parameters, a, and the surrounding field parameter ω. We have examined the features using Dyonic black holes, including horizon structure, photon orbit, and ISCO radius, to better understand the effect of black hole parameters on their behavior. Our findings indicate that by increasing the electric charge $q_E$, magnetic charge, $q_M$, and surrounding field parameter ω brings the orbit closer to the central compact object. In contrast, the fluid parameter a has an opposing effect, shifting the ISCO outward. Wa have also determined the deflection angle of light rays surrounding the black hole in a weak plasma environment using the uniform and SIS plasma fields, and found that black holes parameters have clear effect on deflection angle.