Abstract:Large-scale magnetic fields play a vital role in determining the angular momentum transport and in generating jets/outflows in the accreting systems, yet their origin remains poorly understood. We focus on radiatively inefficient accretion flows (RIAF) around the black holes, and conduct three-dimensional general-relativistic magnetohydrodynamic (GRMHD) simulations using the Athena++ code. We first re-confirm that the dynamo action alone cannot provide sufficient magnetic flux required to produce a strong jet.… Show more
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