Thermal abundance of non-relativistic relics with Sommerfeld enhancement
arXiv:1008.2905 · doi:10.1016/j.nuclphysb.2011.05.009
Abstract
We propose an analytic treatment for computing the relic abundances of non-relativistic particles whose annihilation rate at chemical decoupling is increased by Sommerfeld enhancement. We find approximate rational functions that closely fit the thermal average of Sommerfeld-enhanced cross sections in the massless limit of force carriers for s- and p-wave annihilations. We demonstrate that, with the approximate thermally-averaged cross sections implemented, the standard analytic method for the final relic abundances provides accuracy to within 1% even for the case of Sommerfeld enhancement.
12 pages, 3 figures; discussions and references added
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Cited by in corpus (6)
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- Effects of QCD bound states on dark matter relic abundance
- Likelihood Analysis of the Minimal AMSB Model
- Neutrino forces and the Sommerfeld enhancement
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