摘要: We review the current state of understanding how accretion onto a black hole proceeds and what key elements needed to form relativistic jets are. Theoretical progress is severely undermined by lack thorough microphysics involved in discs formation jets, particularly presence strong magnetic fields. Therefore, all proposed solutions are still models that need be validated observational constraints. (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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