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Weakly Self-interacting Dark Matter and the Structure of Dark Halos

Weakly Self-interacting Dark Matter and the Structure of Dark Halos

We study the formation of dark halos in a ΛCDM universe under the assumption that cold dark matter (CDM) particles have a finite cross section for elastic collisions. We compare evolution when CDM mean free paths are comparable to halo sizes with the collisionless and fluid limits. We show that …