I was skipping through Curt Jaimungal's recent interview with Juan Maldacena, and around 15:48 he mentions the near-horizon scale symmetry of extremal black holes, and how it gives them a long wormhole-like "throat".
It reminded me of how the anomalous rotation curves of galaxies show a similar structure, but without a horizon. And then I thought of Ashoke Sen's latest paper, "How to Expose a Black Hole", in which he talks about smoothly evolving a quantum black hole into something without an event horizon, by varying the dilaton.
So could it be that galaxies are continuous with extremal black holes in this way, and that's why they show MOND-like modified gravity at the boundary with intergalactic space? It's a wacky idea but could be investigated more deeply.
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