Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-07-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 7 figures, submitted to PRD. v2 adds the KITP preprint number and a comment on accelerator searches for light gauge
Scientific paper
In models of dark matter with Sommerfeld-enhanced annihilation, where the annihilation rate scales as the inverse velocity, models of local substructure motivated by N-body dark matter simulations imply a local annihilation signal dominated by small, dense, cold subhalos. This contrasts with the usual assumption of a signal originating from the smooth dark matter halo, with much higher velocity dispersion. Accounting for local substructure modifies the favored parameter regions for Sommerfeld-enhanced annihilating DM explanations for the PAMELA and Fermi excesses. Limits from the inner galaxy and the CMB are weakened, without introducing new tension with substructure-dependent limits, such as from dwarf galaxies or isotropic gamma-ray studies. With substructure, previously excluded parameter regions with mediators of mass <~ 200 MeV are now easily allowed. For very light mediators, subhalos in a specific range of host halo masses may be evaporated, further suppressing diffuse signals without affecting substructure in the Milky Way.
Slatyer Tracy R.
Toro Natalia
Weiner Neal
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