Perturbations and Greybody Factors of AdS Black Holes with a Cloud of Strings Surrounded by Quintessence-like Field in NLED Scenario

TL;DR

This paper investigates how exotic matter sources like a cloud of strings and quintessence influence the perturbations, thermodynamics, and Hawking radiation transmission of AdS black holes within a nonlinear electrodynamics framework, revealing helicity-dependent effects.

Contribution

It introduces a comprehensive analysis of perturbations and greybody factors for AdS black holes with combined nonlinear electrodynamics, string clouds, and quintessence, highlighting novel helicity-dependent transmission phenomena.

Findings

Hawking temperature depends strongly on horizon radius and nonlinear charge.

Greybody factors vary with field spin and matter parameters, affecting Hawking radiation.

Fermionic modes show helicity-dependent maximal transmission at specific quintessence values.

Abstract

The discovery of gravitational waves and advances in black hole imaging have opened new opportunities to probe exotic physics in strong-field regimes. Building upon a recent black hole solution in Einstein gravity coupled with nonlinear electrodynamics and exotic matter sources-specifically a cloud of strings and a quintessence field--we study the perturbative dynamics, thermodynamic behavior, and quantum transmission characteristics in anti-de Sitter spacetime. The black hole, defined by its mass, nonlinear magnetic charge, string cloud, and quintessence parameters, exhibits modified spacetime geometry, horizon structure, Hawking temperature, and effective potentials governing field propagation. We derive Schr\"{o}dinger-like equations for massless scalar, electromagnetic, and fermionic perturbations, exploring how these sources jointly shape the potential barriers. The Hawking temperature shows strong dependence on the horizon radius and nonlinear charge, differing markedly from asymptotically flat cases due to the cosmological constant. Greybody factors, describing Hawking radiation transmission probabilities, are computed for all field spins via turning point analysis. A notable result arises in the fermionic sector: positive and negative helicity modes attain maximal transmission at distinct quintessence normalization values, revealing helicity-dependent coupling absent in bosonic channels. This asymmetry suggests a potential observational signature of spin-exotic matter interactions, offering new insights into detecting quintessence through black hole radiation spectra. Our results extend previous perturbative analyses by incorporating nonlinear electrodynamics, cosmic strings, and quintessence effects--linking quantum radiation studies to gravitational wave astronomy and early-universe cosmology.