Dr. Samik Mitra

Recent polarimetric images by Event Horizon Telescope (EHT) reveals the presence of strong magnetic fields around supermassive black holes (SMBHs). However, the origin of such fields in the vicinity of BHs remains unclear. Existing research suggests that these large-scale fields are predominantly sourced either from companion stars which are tidally locked or coming from the interstellar medium. Nevertheless, the mechanism by which such large-scale magnetic fields are advected near BHs remains an unresolved scientific question. In this talk, I will delve into the physics of advection-dominated disks, which elucidate the accumulation of magnetic fields and their possible structures around these cosmic entities. To elucidate the physics and dynamics of magnetized disks, I will also discuss the general relativistic magnetohydrodynamics (GRMHD) simulations as well as analytical frameworks, which prove to be invaluable tools in this field. Also I will touch upon the connection of accretion disk physics with the Gravitational wave production for a broader future scope of the field.