Reexamining the constraint on the helium abundance from the CMB
Abstract
We revisit the constraint on the primordial helium mass fraction Y_{p} from observations of cosmic microwave background (CMB) alone. By minimizing χ^{2} of recent CMB experiments over 6 other cosmological parameters, we obtained rather weak constraints as 0.17≤Y_{p}≤0.52 at 1σ 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 Y_{p} 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.
 Publication:

Physical Review D
 Pub Date:
 March 2006
 DOI:
 10.1103/PhysRevD.73.063528
 arXiv:
 arXiv:astroph/0601099
 Bibcode:
 2006PhRvD..73f3528I
 Keywords:

 98.80.Ft;
 26.35.+c;
 98.70.Vc;
 Origin formation and abundances of the elements;
 Big Bang nucleosynthesis;
 Background radiations;
 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 15 pages, 5 figures, published version