Observational Evidence for Self-Interacting Cold Dark Matter

David N. Spergel and Paul J. Steinhardt
Phys. Rev. Lett. 84, 3760 – Published 24 April 2000
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Abstract

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.

  • Received 20 September 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.3760

©2000 American Physical Society

Authors & Affiliations

David N. Spergel and Paul J. Steinhardt

  • Princeton University, Princeton, New Jersey 08544

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Issue

Vol. 84, Iss. 17 — 24 April 2000

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