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- W2027156723 abstract "A new evaluation of the constraint on the number of light neutrino species (${N}_{ensuremath{nu}}$) from big bang nucleosynthesis suggests a discrepancy between the predicted light element abundances and those inferred from observations, unless the inferred primordial $^{4}mathrm{He}$ abundance has been underestimated by 0.014ifmmodepmelsetextpmfi{}0.004 ($1ensuremath{sigma}$) or less than 10% (95% C.L.) of $^{3}mathrm{He}$ survives stellar processing. With the quoted systematic errors in the observed abundances and a conservative chemical evolution parametrization, the best fit to the combined data is ${N}_{ensuremath{nu}}=2.1ifmmodepmelsetextpmfi{}0.3$ ($1ensuremath{sigma}$) and the upper limit is ${N}_{ensuremath{nu}}<2.6$ (95% C.L.). The data are inconsistent with the standard model (${N}_{ensuremath{nu}}=3$) at the 98.6% C.L." @default.
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- W2027156723 date "1995-11-27" @default.
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- W2027156723 title "Big Bang Nucleosynthesis in Crisis?" @default.
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- W2027156723 doi "https://doi.org/10.1103/physrevlett.75.3977" @default.
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