Big Bang Nucleosynthesis in Crisis?

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dc.creatorHata, N.
dc.creatorScherrer, R. J.
dc.creatorSteigman, G.
dc.creatorThomas, D.
dc.creatorWalker, T. P.
dc.creatorBludman, S.
dc.creatorLangacker, P.
dc.date1995-05-16
dc.date1995-11-07
dc.date.accessioned2026-07-07T13:02:38Z
dc.date.available2026-07-07T13:02:38Z
dc.descriptionA new evaluation of the constraint on the number of light neutrino species (N_nu) from big bang nucleosynthesis suggests a discrepancy between the predicted light element abundances and those inferred from observations, unless the inferred primordial 4He abundance has been underestimated by 0.014 +/- 0.004 (1 sigma) or less than 10% (95%C.L.) of 3He survives stellar processing. With the quoted systematic errors in the observed abundances and a conservative chemical evolution parameterization, the best fit to the combined data is N_nu = 2.1 +/- 0.3 (1 sigma) and the upper limit is N_nu < 2.6 (95% C.L.). The data are inconsistent with the Standard Model (N_nu = 3) at the 98.6% C.L.
dc.descriptionTo be published in Phys. Rev. Lett. Revised version to reflect referee comments and criticisms by Copi, Schramm, and Turner of robustness of D/He-3 analysis. Small quantitative changes but qualitative conclusions unchanged. Question mark added to title. Entire ps file available at ftp://upenn5.hep.upenn.edu/pub/hata/papers/bbn.ps.Z See also astro-ph/9412087
dc.identifierhttps://arxiv.org/abs/hep-ph/9505319
dc.identifierhttp://arxiv.org/abs/hep-ph/9505319
dc.identifierPhys.Rev.Lett.75:3977-3980,1995
dc.identifierdoi:10.1103/PhysRevLett.75.3977
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226511
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleBig Bang Nucleosynthesis in Crisis?
dc.typetext

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