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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3131
DTSTART:20131119T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T211910Z
LAST-MODIFIED:20131118T054332Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Detecting dark Matter sub halos with Gaia\, Theory Seminar (Hi
 gh Energy/Cosmology)\, Douglas Spolyar\, Institut d’astrophysiq
 ue de Paris
DESCRIPTION:Cold Dark Matter (CDM) theory\, a pillar of modern cosmolo
 gy and astrophysics\, predicts the existence of a large number of star
 less 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 detecta
 ble\, velocity changes that an orbiting substructure imposes on the st
 ars in the MW disk. Using high-resolution numerical simulations we est
 imate that the new space telescope Gaia should detect the kinematic si
 gnatures of a few starless substructures provided the CDM paradigm hol
 ds. Such a measurement will provide unprecedented constraints on the p
 rimordial matter power spectrum at low-mass scales and offer a new han
 dle onto the particle physics properties of dark matter. 
URL:https://www.physics.wisc.edu/events/?id=3131
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