A new estimate of the uncertainties in the primordial helium abundance: New bounds on omega baryons

Details A new estimate of the uncertainties in the primordial helium abundance: New bounds on omega baryons A new estimate of the uncertainties in the primordial helium abundance: New bounds on omega baryons

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444l...5s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 1, p. L5-L8

Mathematics

Logic

59

Abundance, Cosmology, Errors, H Ii Regions, Helium, Omega-Mesons, Radiative Transfer, Absorptivity, Lyman Spectra, Metallicity, Radiant Flux Density

Scientific paper

We reexamine the systematic errors in the determination of the primordial helium abundance, YP. We find that the systematics are significantly larger than the statistical errors. The uncertainty in (the determination of) YP is thus larger than is currently claimed. Furthermore, all these systematics lead to an underestimate of YP. We argue that the true upper bound on YP could be as large as 0.255, which allows cosmological models with no nonbaryonic dark matter in which Omegatotal = Omegabaryons = 0.2 (h50)2.

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