Observational features of thin accretion disk around rotating regular black hole

• Published in: The European physical journal. C, Particles and fields Vol. 85; no. 5; pp. 514 - 11
• Main Author: Li, Zhen
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 10.05.2025; Springer Nature B.V; SpringerOpen
• Subjects: Accretion disks; Angular momentum; Astronomy; Astrophysics and Cosmology; Black holes; Circular orbits; Elementary Particles; Hadrons; Heavy Ions; Inclination; Luminosity; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameters; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Ray tracing; Regular Article - Theoretical Physics; Relativity; Rotating disks; Rotation; Spacetime; String Theory
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-025-14255-1

Rotating regular black hole, as a promising extension beyond general relativity, offer a phenomenological model that resolves spacetime singularities. In this study, we investigate the observational features of thin accretion disk around a well-known rotating regular black hole, which introduce an exponential converge factor e - k / r to the black hole mass M, where k is the regular parameter. By studying the effects of the regular parameter on key quantities such as energy, angular momentum, and the innermost stable circular orbits of a test particle, we are able to analyze the radiative flux, temperature, and differential luminosity of the thin accretion disk in this rotation regular black hole spacetime. By using the ray-tracing method, we also obtain the bolometric images of thin accretion disk around this rotating regular black hole, with various black hole spins and inclination angels. Our results show that the regular parameter significantly impacts the observables, enhancing the radiation efficiency of thin accretion disk and contracting the lensing bands of black hole image, compared to Kerr black hole. These effects become more pronounced for rapidly rotating regular black hole and large inclination angels, making them more detectable in astrophysical observations.