<< September 2016 >>
Sun Mon Tue Wed Thu Fri Sat
   1   2   3 
 4   5   6   7   8   9   10 
 11   12   13   14   15   16   17 
 18   19   20   21   22   23   24 
 25   26   27   28   29   30   
Add an Event Edit This Event

This Week at Physics

<< Spring 2016 Fall 2016 Spring 2017 >>
Subscribe to receive email announcements of events

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.
Add this event to your calendar

©2013 Board of Regents of the University of Wisconsin System