3 papers
astro-ph.HE2026
Wave interference as the origin of the cyclic magnetorotational dynamo in accretion disks: insights from weakly nonlinear theory and local shearing box simulations
Uddipan Banik, Amitava Bhattacharjee, James M. Stone
Long-period cyclic reversals of the large-scale magnetic field are a prominent feature of the dynamo associated with the magnetorotational instability (MRI) in accretion disks, but…
astro-ph.SR2025
The Interplay of Parametric and Magnetorotational Instabilities in Oscillatory Shear Flows
Callum W. Fairbairn, James M. Stone
The evolution of warped disks is governed by internal, oscillatory shear flows driven by their distorted geometry. However, these flows are known to be vigorously unstable to a hyd…
astro-ph.HE2025
Cyclic Zoom: Multiscale GRMHD Modeling of Black Hole Accretion and Feedback
Minghao Guo, James M. Stone, Eliot Quataert +1
We present a ``cyclic zoom'' method to capture the dynamics of accretion flows onto black holes across a vast range of spatial and temporal scales in general relativistic magnetohy…