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 …

There is a broad consensus that accretion onto supermassive black holes and consequent
jet formation power the observed emission from active galactic nuclei (AGNs). However …

We study super-Eddington accretion flows onto black holes using a global three-
dimensional radiation magneto-hydrodynamical simulation. We solve the time-dependent …

Merging binaries consisting of two neutron stars (NSs) or an NS and a stellar-mass black
hole typically form a massive accretion torus around the remnant black hole or long-lived …

Expulsion of neutron-rich matter following the merger of neutron star binaries is crucial to the
radioactively powered electromagnetic counterparts of these events and to their relevance …

We investigate the nucleosynthesis of heavy elements in the winds ejected by accretion
discs formed in neutron star mergers. We compute the element formation in disc outflows …

We consider observational and theoretical estimates of the accretion disc viscosity
parameter α. We find that in thin, fully ionized discs, the best observational evidence …

We present the detailed global structure of black hole accretion flows and outflows through
newly performed two-dimensional radiation-magnetohydrodynamic simulations. By starting …

We conduct global three-dimensional radiation magnetohydrodynamic simulations of the
inner regions of accretion flows around a 5× 10 8 M⊙ black hole, with mass accretion rates …

We study the behavior of magnetorotational turbulence in shearing box simulations with a
radial and azimuthal extent up to 10 scale heights. Maxwell and Reynolds stresses are …