Accretion disk radiation dynamics and the cosmic battery

TL;DR

This paper explores radiation dynamics in accretion disks around Kerr black holes, focusing on disk-originated radiation, photon trajectories, and the Cosmic Battery mechanism to understand magnetic field generation.

Contribution

It introduces a novel analysis of disk-originated radiation effects and calculates the Cosmic Battery electromotive source near the inner disk edge.

Findings

Generated numerical sky maps from photon trajectories.

Analyzed various accretion disk morphologies.

Estimated timescales for magnetic field generation via the Cosmic Battery.

Abstract

We investigate the dynamics of radiation in an astrophysical accretion disk around a Kerr black hole. The source of the radiation is the accretion disk itself, and not a central object as in previous studies of the Poynting-Robertson effect. We generate numerical sky maps from photon trajectories that originate on the surface of the disk as seen from the inner edge of the disk at the position of the innermost stable circular orbit (ISCO). We investigate several accretion disk morphologies with a Shakura-Sunyaev surface temperature distribution. Finally, we calculate the electromotive source of the Cosmic Battery mechanism around the inner edge of the accretion disk and obtain characteristic timescales for the generation of astrophysical magnetic fields.