Accretion disks properties around regular black hole solutions obtained from non-linear electrodynamics

TL;DR

This study analyzes how regular black hole solutions from nonlinear electrodynamics affect accretion disk properties, revealing increased energy emission and efficiency compared to Schwarzschild black holes.

Contribution

It introduces a detailed analysis of accretion disks around regular black holes from nonlinear electrodynamics, highlighting significant spectral and efficiency modifications.

Findings

Higher energy emission from disks

Increased temperature of accretion disks

Enhanced mass-to-radiation conversion efficiency

Abstract

We investigate a family of spherically symmetric, static, charged regular black hole solutions derived within the framework of Einstein-nonlinear electrodynamics. Our study focuses on examining the characteristics of accretion disks in the spacetimes described by the Dymnikova and Fan-Wang solutions. We explore circular geodesics of test particles and calculate various properties, including the radius of the innermost stable circular orbit, radiant energy, temperature, and conversion efficiency of accretion mass into radiation. We employ the Novikov-Thorne-Page thin accretion disk model as a background. By comparing our findings with those obtained in the Schwarzschild black hole case, we reveal significant modifications in the overall spectral properties. Specifically, we observe an increase in the energy emitted from the disk surface, resulting in higher temperatures for the accretion disks under certain values of the free parameters. Consequently, we note an enhanced efficiency of mass conversion into radiation compared to the Schwarzschild spacetime.