Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement

@article{Zavala2010RelicDA,
  title={Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement},
  author={Jes{\'u}s Zavala and Mark Vogelsberger and Simon D. M. White Mpa and HarvardCfA},
  journal={Physical Review D},
  year={2010},
  volume={81},
  pages={1-10}
}
We calculate how the relic density of dark matter particles is altered when their annihilation is enhanced by the Sommerfeld mechanism due to a Yukawa interaction between the annihilating particles. Maintaining a dark matter abundance consistent with current observational bounds requires the normalization of the s-wave annihilation cross section to be decreased compared to a model without enhancement. The level of suppression depends on the specific parameters of the particle model, with the… 

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