Scientific Program held at Nordita, Stockholm, 10 October - 4 November 2016. Dark Matter (DM) binds our galaxy together and is at the heart of modern cosmology. The current Lambda Cold DM paradigm has had great success on large scales, but a detailed understanding of the distribution of DM on smaller scales is still lacking where new data from Gaia could challenge the CDM scenario or rule out competing models such as warm dark matter. Gaia will measure the proper motion and distances of on the order of a billion stars in the Milky Way's disk, bulge and halo, as well as in a few individual Milky Way satellites. The focus of the workshop is to bring theorists (particle physicists and astrophysicists), modelers, and observers together in order to discuss ideas, methods, and modeling to focus our understanding of the local universe revealed by Gaia at a critical time when the first data from Gaia will become available.
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