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First Results on Dark Matter Substructure from Astrometric Weak Lensing

Van Tilburg, Ken; Weiner, Neal; Taki, Anna-Maria +1 more

Low-mass structures of dark matter (DM) are expected to be entirely devoid of light-emitting regions and baryons. Precisely because of this lack of baryonic feedback, small-scale substructures of the Milky Way are a relatively pristine testing ground for discovering aspects of DM microphysics and primordial fluctuations on subgalactic scales. In t…