Reexamining the constraint on the helium abundance from the CMB

@article{Ichikawa2006ReexaminingTC,
  title={Reexamining the constraint on the helium abundance from the CMB},
  author={Kazuhide Ichikawa and Tomo Takahashi},
  journal={Physical Review D},
  year={2006},
  volume={73},
  pages={063528}
}
We revisit the constraint on the primordial helium mass fraction ${Y}_{p}$ from observations of cosmic microwave background (CMB) alone. By minimizing ${\ensuremath{\chi}}^{2}$ of recent CMB experiments over 6 other cosmological parameters, we obtained rather weak constraints as $0.17\ensuremath{\le}{Y}_{p}\ensuremath{\le}0.52$ at $1\ensuremath{\sigma}$ C.L. for a particular data set. We also study the future constraint on cosmological parameters when we take account of the prediction of the… 

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