MG11 
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3D Simulations of Tilted, Magnetized Accretion Disks Around Rapidly Rotating Black Holes

In this talk I posit that accreting compact objects, including stellar mass black holes and neutron stars as well as supermassive black holes, may undergo extended periods of accretion during which the angular momentum of the disk at large scales is misaligned with that of the compact object. In such a scenario, differential Lense-Thirring precession caused by the rotating compact object will tend to twist the disk. Depending on how effective angular momentum transport is, the disk may attain one of several configurations. In this presentation I describe results from a three-dimensional relativistic magnetohydrodynamic simulation of an MRI turbulent disk accreting onto a tilted rapidly rotating black hole. For this case, the disk does not achieve the commonly described Bardeen-Petterson configuration; rather, it settles into a truncated oscillating structure, which gradually settles toward the symmetry plane of the black hole. Further details and implications of these results will be presented in the talk.