Cosmic microwave background constraint on residual annihilations of relic particles

@article{Mcdonald2000CosmicMB,
  title={Cosmic microwave background constraint on residual annihilations of relic particles},
  author={Patrick Mcdonald and Robert J. Scherrer and Terry P. Walker},
  journal={Physical Review D},
  year={2000},
  volume={63},
  pages={023001}
}
Energy injected into the cosmic microwave background at redshifts z{approx} (equivalent to){sigma}{sub 0}, the bound is f(m{sub X}/MeV){sup -1}[({sigma}{sub 0}/6x10{sup -27} cm{sup 3}s{sup -1})({Omega}{sub X{bar X}}h{sup 2}){sup 2}]<0.2, where m{sub X} is the particle mass, {Omega}{sub X{bar X}} is the fraction of the critical density the particle and its antiparticle contribute if they survive to the present time, h=H{sub 0}/100 kms{sup -1}Mpc{sup -1}, H{sub 0} is the Hubble constant, and f is… 

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