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Astrophysics Luncheon Seminar

New Constraints on the Nature of Dark Matter with Quadruple-image Strong Gravitational Lenses
Presented by Daniel Gilman
University of California, Los Angeles

Monday, October 21, 2019
12:00 noon in 169-336

Abstract
Strong gravitational lensing by galaxies provides a unique and powerful means of probing dark-matter structure on sub-galactic scales. On small scales, various dark-matter models make unique predictions for the abundance and density profiles of dark matter subhalos and field halos. The magnification ratios between the images of a background quasar produced in quadruple-image strong lenses are sensitive to these low-mass structures, providing a means to test dark-matter models on scales where halos are mostly, if not completely, dark. I will describe recent work that uses a novel forward modeling technique to place stringent constraints on the free-streaming length of dark matter, and the first constraint on the mass-concentration relation of cold dark matter halos on sub-galactic scales across cosmological distance.

JPL Contact: Anna Nierenberg


SVCP Astrophysics


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