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 …

Magnetic reconnection can power bright, rapid flares originating from the inner
magnetosphere of accreting black holes. We conduct extremely high-resolution (5376× …

The formation of jets in black hole accretion systems is a long-standing problem. It has been
proposed that a jet can be formed by extracting the rotation energy of the black hole (“BZ …

Hot spots, or plasmoids, which form due to magnetic reconnection in current sheets, are
conjectured to power frequent X-ray and near-infrared flares from Sgr A*, the black hole in …

We present the results of nine simulations of radiatively inefficient magnetically arrested
discs (MADs) across different values of the black hole spin parameter a*:− 0.9,− 0.7,− 0.5 …

We describe global, 3D, time‐dependent, non‐radiative, general‐relativistic,
magnetohydrodynamic simulations of accreting black holes (BHs). The simulations are …

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) …

We evolve two high-resolution general relativistic magnetohydrodynamic simulations of
advection-dominated accretion flows around nonspinning black holes (BHs), each over a …

We present the first numerical simulations that track the evolution of a black hole–neutron
star (BH–NS) merger from premerger to r≳ 10 11 cm. The disk that forms after a merger of …