Observational evidence for self-interacting cold dark matter

David N. Spergel, Paul J. Steinhardt

Research output: Contribution to journalArticlepeer-review

1577 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)3760-3763
Number of pages4
JournalPhysical review letters
Issue number17
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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