Speaker
Description
Low-angular momentum accretion onto black holes represents distinct differences from the standard disk paradigm, giving rise to transonic flows, standing shocks, and dynamically evolving structures in the near-horizon region. Using advanced general relativistic magnetohydrodynamic (GRMHD) simulations, we investigate the nonlinear behavior and long-term evolution of such flows around rotating black holes. Our results show that shocks in these low-angular momentum regimes can persist, oscillate, and generate variability imprints in the emitted radiation. In particular, we identify unique centi-Hz quasi-periodic oscillations (QPOs) that naturally arise for supermassive black holes, providing a potential observational signature. I will discuss the physical origin of these oscillations, their dependence on black hole spin and magnetic flux distribution, and their implications for interpreting variability from active galactic nuclei (AGNs) and black hole X-ray binary sources (BH-XRBs).
| Session Selection | Astronomy and Astrophysics |
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