Accretion disk around regular black holes

TL;DR

This paper investigates the properties of accretion disks around regular black holes, specifically Bardeen and Hayward models, revealing their efficiency in converting mass to radiation and their similarities to slowly rotating Kerr black holes.

Contribution

It provides a detailed analysis of the accretion disk properties around Bardeen and Hayward regular black holes, highlighting their increased efficiency and ability to mimic Kerr black holes.

Findings

Inner stable orbit shifts inward for regular black holes.

Enhanced radiant energy, luminosity, and temperature profiles.

Higher mass-to-radiation conversion efficiency compared to Schwarzschild black holes.

Abstract

Regular black holes are crucially important as approaches to solving the singularity problem, and in this paper, the accretion disk of Bardeen and Hayward models have been studied. For this purpose, we calculated the physical properties of black holes, including radiant energy, luminosity derivative, temperature, and conversion efficiency of accretion mass into radiation. The obtained results show that the non-zero-free parameters of regular black holes cause the radius of the innermost stable circular orbit of the disk to shift to smaller values. As a result of this displacement, we saw an increase in the profiles of radiant energy, luminosity derivative, and temperature. We also find that Bardeen and Hayward's black holes are more efficient in converting mass to radiation than Schwarzschild. Finally, we compared the free parameter of these two black holes with the spin of the rotating black hole and found that the Bardeen and Hayward black holes can mimic the slowly rotating Kerr black hole.