Dark matter around a rotating black hole has negligible effect on its shadow below a critical mass threshold, after which all structures expand significantly while the shadow remains nearly circular, implying dark matter must be absent or limited near black holes to match observations.
Existence of wormhole in Dekel–Zhao dark matter halo
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Shadow of rotating black hole surrounded by dark matter
Dark matter around a rotating black hole has negligible effect on its shadow below a critical mass threshold, after which all structures expand significantly while the shadow remains nearly circular, implying dark matter must be absent or limited near black holes to match observations.