Influences of modified Chaplygin dark fluid around a black hole

TL;DR

This paper investigates a modified Chaplygin gas model around a charged AdS black hole, analyzing its effects on geodesics, shadows, Hawking radiation, and quasinormal modes, with observational constraints from EHT data.

Contribution

It introduces a novel MCG-inspired charged AdS black hole model and explores its physical and astrophysical properties, including observational constraints.

Findings

Model parameters influence black hole shadow and light deflection.

Hawking temperature and evaporation are affected by MCG parameters.

Constraints from EHT data suggest the model's astrophysical relevance.

Abstract

In this work, we study a static, spherically charged AdS black hole within a modified cosmological Chaplygin gas (MCG), adhering to the calorific equation of state, as a unified dark fluid model of dark energy and dark matter. We explore the influence of model parameters on several characteristics of the MCG-motivated charged AdS black hole (MCG-AdSBH), including the geodesic structure and some astrophysical phenomena such as null trajectories, shadow silhouettes, light deflection angles, and the determination of greybody bounds. We then discuss how the model parameters affect the Hawking temperature, remnant radius, and evaporation process of the MCG-AdSBH. Quasinormal modes are also investigated using the eikonal approximation method. Constraints on the MCG-AdSBH parameters are derived from EHT observations of M87* and Sgr A*, suggesting that MCG-AdSBH could be strong candidates for astrophysical black hole.