Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-05
Phys.Rev. D73 (2006) 063528
Astronomy and Astrophysics
Astrophysics
15 pages, 5 figures, published version
Scientific paper
10.1103/PhysRevD.73.063528
We revisit the constraint on the primordial helium mass fraction Yp from observations of cosmic microwave background (CMB) alone. By minimizing chi square of recent CMB experiments over 6 other cosmological parameters, we obtained rather weak constraints as 0.17 < Yp < 0.52 at 1 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 standard big bang nucleosynthesis (BBN) theory as a prior on the helium mass fraction where Yp can be fixed for a given energy density of baryon. We discuss the implications of the prediction of the standard BBN on the analysis of CMB.
Ichikawa Kazuhide
Takahashi Tomo
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