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 …

▪ Abstract The status of our current understanding of angular momentum transport in
accretion disks is reviewed. The last decade has seen a dramatic increase both in the …

Black hole (BH) shadows can be used to probe new physics in the form of ultralight particles
via the phenomenon of superradiant instability. By directly affecting the BH mass and spin …

We examine the disc—jet connection in stellar mass and supermassive black holes by
investigating the properties of their compact emission in the X-ray and radio bands. We …

A distinct visual signature occurs in black holes that are surrounded by optically thin and
geometrically thick emission regions. This signature is a sharp-edged dip in brightness that …

We present results from two long-duration general relativistic magneto-hydrodynamic
(GRMHD) simulations of advection-dominated accretion around a non-spinning black hole …

We construct evolutionary models of the populations of active galactic nuclei (AGNs) and
supermassive black holes, in which the black hole mass function grows at the rate implied …

We present three-dimensional MHD simulations of rotating radiatively inefficient accretion
flows onto black holes. We continuously inject magnetized matter into the computational …

Many models of gamma-ray bursts (GRBs) involve accretion onto a compact object, usually
a black hole, at a mass accretion rate on the order of a fraction of a solar mass per second. If …

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