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This Week at Physics

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Event Number 3131

  Tuesday, November 19th, 2013

Theory Seminar (High Energy/Cosmology)
Detecting dark Matter sub halos with Gaia
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Douglas Spolyar, Institut d’astrophysique de Paris
Abstract: Cold Dark Matter (CDM) theory, a pillar of modern cosmology and astrophysics, predicts the existence of a large number of starless dark matter halos surrounding the Milky Way (MW). However, clear observational evidence of these "dark" substructures remains elusive. Here, we present a detection method based on the small, but detectable, velocity changes that an orbiting substructure imposes on the stars in the MW disk. Using high-resolution numerical simulations we estimate that the new space telescope Gaia should detect the kinematic signatures of a few starless substructures provided the CDM paradigm holds. Such a measurement will provide unprecedented constraints on the primordial matter power spectrum at low-mass scales and offer a new handle onto the particle physics properties of dark matter.
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