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Probing dark matter substructure with astrometric weak lensing

Date and Time: Tuesday, February 23, 2021, 01:00pm -
Location: Zoom:

Speaker: Cristina Mondino (Perimeter Institute)

Low-mass structures of dark matter 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 dark matter microphysics and primordial fluctuations on sub-galactic scales. I will present results from the first search for galactic dark matter subhalos with time-domain astrometric weak gravitational lensing. The analysis is based on a matched-filter template of local lensing corrections to the proper motion of stars in the Magellanic Clouds and is most sensitive to compact dark structures of ten million to a hundred million solar mass.

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