The Big-Bang Nucleosynthesis Limit to the Number of Neutrino Species

Details The Big-Bang Nucleosynthesis Limit to the Number of Neutrino Species The Big-Bang Nucleosynthesis Limit to the Number of Neutrino Species

1996-06-10

arxiv.org/abs/astro-ph/9606059v1

Phys.Rev.D55:3389-3393,1997

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures (LaTeX 2.09 using epsf.sty and rotate.sty)

Scientific paper

10.1103/PhysRevD.55.3389

Concern about systematic uncertainty in the $^4$He abundance as well as the chemical evolution of $^3$He leads us to re-examine this important limit. It is shown that with conservative assumptions no more than the equivalent of 4 massless neutrino species are allowed. Even with the most extreme estimates of the astrophysical uncertainties a meaningful limit still exists, less than 5 massless neutrino species, and illustrates the robustness of this argument. A definitive measurement of the deuterium abundance in high-redshift hydrogen clouds should soon sharpen the limit.

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