Annihilating Cold Dark Matter

Details Annihilating Cold Dark Matter Annihilating Cold Dark Matter

2000-05-10

arxiv.org/abs/astro-ph/0005210v2

Phys.Rev.Lett.85:3335,2000

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in Physical Review Letters. Included the effect of adiabatic expansion. Some changes

Scientific paper

10.1103/PhysRevLett.85.3335

Structure formation with cold dark matter (CDM) predicts halos with a central density cusp, which are observationally disfavored. If CDM particles have an annihilation cross section sigma*v ~ 10**(-29) (m/GeV) cm**2, then annihilations will soften the cusps. We discuss plausible scenarios for avoiding the early Universe annihilation catastrophe that could result from such a large cross section. The predicted scaling of core density with halo mass depends upon the velocity dependence of sigma*v, and s-wave annihilation leads to a core density nearly independent of halo mass, which seems consistent with observations.

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