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An excess of small-scale gravitational lenses observed in galaxy clusters

Grillo, Claudio; Rosati, Piero; Meneghetti, Massimo +11 more

Cold dark matter (CDM) constitutes most of the matter in the Universe. The interplay between dark and luminous matter in dense cosmic environments, such as galaxy clusters, is studied theoretically using cosmological simulations. Observations of gravitational lensing are used to characterize the properties of substructures—the small-scale distribu…