Dark-matter mass around a Kerr black hole enlarges horizons and shadows only above a critical value and circularizes the silhouette, implying local DM mass must stay below that threshold to match EHT sizes.
Rotating charged black holes in EMS theory: shadow studies and constraints from EHT observations
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Shadow of rotating black hole surrounded by dark matter
Dark-matter mass around a Kerr black hole enlarges horizons and shadows only above a critical value and circularizes the silhouette, implying local DM mass must stay below that threshold to match EHT sizes.