Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 17, Pages 3760-3763Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3760
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Cosmological models with cold dark matter composed of weakly interacting particles predict overly dense cores in the centers of galaxies and clusters and an overly large number of halos within the Local Group compared to actual observations. We propose that the conflict can be resolved if the cold dark matter particles are self-interacting with a large scattering cross section but negligible annihilation or dissipation. In this scenario, astronomical observations may enable us to study dark matter properties that are inaccessible in the laboratory.
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