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A powerful local shear instability in weakly magnetized disks. I - Linear analysis. II - Nonlinear evolution
A broad class of astronomical accretion disks is presently shown to be dynamically unstable to axisymmetric disturbances in the presence of a weak magnetic field, an insight with consequently broad
Instability, turbulence, and enhanced transport in accretion disks
Recent years have witnessed dramatic progress in our understanding of how turbulence arises and transports angular momentum in astrophysical accretion disks. The key conceptual point has its origins
Linear analysis of the Hall effect in protostellar disks
The effects of Hall electromotive forces (HEMFs) on the linear stability of protostellar disks are examined. Earlier work on this topic focused on axial field and perturbation wavenumber geometry.
Enhanced Angular Momentum Transport in Accretion Disks
▪ 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 recognition of key physical...
The Dynamical Structure of Nonradiative Black Hole Accretion Flows
We analyze three-dimensional magnetohydrodynamic simulations of a nonradiative accretion flow around a black hole using a pseudo-Newtonian potential. The flow originates from a torus initially
A Powerful Local Shear Instability in Weakly Magnetized Disks. II. Nonlinear Evolution
We consider the dynamical evolution of an accretion disk undergoing Keplerian shear flow in the presence of a weak magnetic field. A linear perturbation analysis presented in a companion paper shows
A powerful local shear instability in weakly magnetized disks. IV: Nonaxisymmetric perturbations
In this paper, we continue our study of a powerful axisymmetric MHD instability recently put forward by the authors as the underlying cause of anomalous transport in accretion disks. The theory of