BIG-BANG NUCLEOSYNTHESIS IN CRISIS

被引：150

作者：

HATA, N ^{[1
]}

SCHERRER, RJ ^{[1
]}

STEIGMAN, G ^{[1
]}

THOMAS, D ^{[1
]}

WALKER, TP ^{[1
]}

BLUDMAN, S ^{[1
]}

LANGACKER, P ^{[1
]}

机构：

[1] UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.75.3977

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A 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 He-4 abundance has been underestimated by 0.014 +/- 0.004 (1 sigma) or less than 10% (95% C.L.) of He-3 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-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.

引用

页码：3977 / 3980

页数：4

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