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 X-ray binaries (BHXBs) are known to display five distinct spectral states. In order
of increasing luminosity these are the quiescent state, low state, intermediate state, high …

Gas supplied conservatively to a black hole at rates well below the Eddington rate may not
be able to radiate effectively and the net energy flux, including the energy transported by the …

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 …

As the luminosity of an accreting black hole drops to a few percent of Eddington, the
spectrum switches from the familiar soft state to a hard state that is well-described by a …

Sagittarius A*, which is located at the Galactic center, is a puzzling source. It has a mass of
M=(2.5±0.4)× 10 6 M &sun;, which makes it an excellent black hole candidate. Observations …

This article presents a comprehensive overview of numerical hydrodynamics and magneto-
hydrodynamics (MHD) in general relativity. Some significant additions have been …

In recent years, much effort has been devoted to unravelling the connection between the
accretion flow and the jets in accreting compact objects. In the present work, we report new …