This review covers the main aspects of black hole accretion disk theory. We begin with the
view that one of the main goals of the theory is to better understand the nature of black holes …

Black hole accretion flows can be divided into two broad classes: cold and hot. Whereas
cold accretion flows consist of cool optically thick gas and are found at relatively high mass …

Black hole (BH) accretion flows and jets are qualitatively affected by the presence of ordered
magnetic fields. We study fully 3D global general relativistic magnetohydrodynamic (MHD) …

Black hole (BH) accretion flows and jets are dynamic hot relativistic magnetized plasma
flows whose radiative opacity can significantly affect flow structure and behaviour. We …

Discretized numerical simulations are a powerful tool for the investigation of nonlinear MHD
turbulence in accretion disks. However, confidence in their quantitative predictions requires …

The power spectra of black hole binaries have been well studied for decades, giving a very
detailed phenomenological picture of the variability properties and their correlation with the …

We report for the first time a γ-ray and multiwavelength nearly periodic oscillation in an
active galactic nucleus. Using the Fermi Large Area Telescope we have discovered an …

A numerical scheme is described for including radiation in multidimensional general
relativistic conservative fluid dynamics codes. In this method, a covariant form of the M1 …

Black-hole accretion systems are known to possess several distinct modes (or spectral
states), such as low/hard state and high/soft state. Since the dynamics of the corresponding …

We present axisymmetric two-temperature general relativistic radiation
magnetohydrodynamic simulations of the inner region of the accretion flow onto the …