"Theorists have a difficult time stimulating how black holes accrete material. The underlying physics is exceedingly complex, especially for supermassive black holes. But one thing is clear: The presence or absence of magnetic fields, and how they arrange themselves around a black hole, plays a critical role in controlling the rate of the accretion flow."
Astronomy Magazine March 2021 "How to Grow a Giant Black Hole" pp. 16-23
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