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Discovering Substellar Dark Matter Halos with Astrometric Weak Lensing of Multiply Imaged Quasars
We propose time-domain astrometric weak lensing of multiply imaged quasars as a probe of substellar dark matter (DM) halos. In $Λ$CDM, the photon path of each macro-image traverses numerous microhalos, which collectively produce a stochastic centroid motion with a calculable red power spectrum. Halo
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