Dents in the Mirror: A Novel Probe of Dark Matter Substructure in Galaxy Clusters from the Astrometric Asymmetry of Lensed Arcs

Derek Perera, Daniel Gilman, Liliya L. R. Williams +5

Astrometric perturbations of lensed arcs behind galaxy clusters have been recently suggested as promising probes of small-scale ($\lesssim 10^9{M}_{\odot }$) dark matter substructure.…