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.
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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.