Relic densities including Sommerfeld enhancements in the MSSM

Abstract

We have developed a general formalism to compute Sommerfeld enhancement (SE) factors for a multi-state system of fermions, in all possible spin configurations and with generic long-range interactions. We show how to include such SE effects in an accurate calculation of the thermal relic density for WIMP dark matter candidates. We apply the method to the MSSM and perform a numerical study of the relic abundance of neutralinos with arbitrary composition and including the SE due to the exchange of the W and Z bosons, photons and Higgses. We find that the relic density can be suppressed by a factor of a few in a seizable region of the parameter space, mostly for Wino-like neutralino with mass of a few TeV, and up to an order of magnitude close to a resonance.

23 pages, 7 figures; table 1 corrected and rearranged, numerical results practically unchanged, matches published version

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Cited by in corpus (4)

• Enhanced One-Loop Corrections to WIMP Annihilation and their Thermal Relic Density in the Coannihilation Region
• Saas-Fee Lecture Notes: Multi-messenger Astronomy and Dark Matter
• Dark matter signals at the LHC: forecasts from ton-scale direct detection experiments
• Lower bound for the ratio of charged wino tracks to charged lepton tracks at LHC