Accretion processes in magnetically and tidally perturbed Schwarzschild black holes

TL;DR

This paper investigates how magnetic and tidal perturbations affect accretion disks around Schwarzschild black holes, revealing shifts in disk stability, increased radiation, and decreased efficiency.

Contribution

It introduces a detailed analysis of accretion processes in perturbed Schwarzschild spacetime, highlighting the effects of magnetic and tidal forces on disk dynamics and radiation.

Findings

Accretion disk shrinks under perturbations.

Marginally stable orbit shifts inward.

Radiation intensity increases and spectrum is blue-shifted.

Abstract

We study the accretion process in the region of the Preston-Poisson space-time describing a Schwarzschild black hole perturbed by asymptotically uniform magnetic field and axisymmetric tidal structures. We find that the accretion disk shrinks and the marginally stable orbit shifts towards the black hole with the perturbation. The radiation intensity of the accretion disk increases, while the radius where radiation is maximal remains unchanged. The spectrum is blue-shifted. Finally, the conversion efficiency of accreting mass into radiation is decreased by both the magnetic and the tidal perturbations.