Discovering Substellar Dark Matter Halos with Astrometric Weak Lensing of Multiply Imaged Quasars

Ken Van Tilburg, David E. Kaplan

We propose time-domain astrometric weak lensing of multiply imaged quasars as a probe of substellar dark matter (DM) halos. In $\Lambda$CDM, each macro-image's light traverses many micro…