Spherically Symmetric Quantum-Corrected Black Holes with String Clouds: A Multi-Observable Analysis

TL;DR

This paper analyzes quantum-corrected black holes with string clouds, exploring their observable signatures in shadows, lensing, and oscillations to distinguish between different quantum gravity models.

Contribution

It introduces two quantum correction models for black holes with string clouds and compares their observable effects across multiple astrophysical phenomena.

Findings

Distinctive gravitational lensing signatures for each model

Different quasi-periodic oscillation frequency patterns

Opposite dependencies of deflection angles on quantum parameters

Abstract

We present an investigation of quantum-corrected black hole spacetimes coupled with clouds of strings, examining two distinct theoretical models that incorporate quantum gravitational effects through different implementations of correction terms. Our study explores the geodesic structure, focusing on photon sphere properties, black hole shadows, and innermost stable circular orbits of test particles around these exotic geometries. The analysis reveals fundamental modifications to particle trajectories that distinguish quantum-corrected solutions from their classical counterparts, with observable implications for high-energy astrophysics. We investigate quasi-periodic oscillations arising from test particle motion, deriving frequency relationships that could serve as observational probes of quantum gravity effects in accreting black hole systems. Through rigorous gravitational lensing analysis using the Gauss-Bonnet theorem, we calculate weak-field deflection angles and identify distinctive signatures that enable discrimination between the two quantum correction models. The gravitational lensing study reveals opposite dependencies on quantum parameters between the models, providing unambiguous observational discriminants. Additionally, we analyze the thermodynamic properties including temperature, entropy, and heat capacity modifications, exploring topological characteristics and phase transition behavior in these quantum-corrected systems. The investigation reveals that the two models exhibit contrasting behaviors across multiple observational channels, from gravitational lensing deflection angles to quasi-periodic oscillation frequencies, providing remarkable discriminants for testing quantum gravity theories.