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

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dc.creatorCopi, Craig J
dc.creatorSchramm, David N.
dc.creatorTurner, Michael S.
dc.date1996-06-10
dc.date.accessioned2026-07-07T10:31:43Z
dc.date.available2026-07-07T10:31:43Z
dc.descriptionConcern 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.
dc.description10 pages, 2 figures (LaTeX 2.09 using epsf.sty and rotate.sty)
dc.identifierhttps://arxiv.org/abs/astro-ph/9606059
dc.identifierhttp://arxiv.org/abs/astro-ph/9606059
dc.identifierPhys.Rev.D55:3389-3393,1997
dc.identifierdoi:10.1103/PhysRevD.55.3389
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178510
dc.subjectAstrophysics
dc.titleThe Big-Bang Nucleosynthesis Limit to the Number of Neutrino Species
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