A big bang nucleosynthesis likelihood analysis of the baryon-to-photon ratio and the number of light particle degrees of freedom

被引：29

作者：

Olive, KA ^{[1
]}

Thomas, D ^{[1
]}

机构：

[1] UNIV FLORIDA, DEPT PHYS, GAINESVILLE, FL 32611 USA

来源：

ASTROPARTICLE PHYSICS | 1997年 / 7卷 / 1-2期

基金：

美国国家航空航天局;

关键词：

D O I：

10.1016/S0927-6505(97)00008-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We extend the model-independent likelihood analysis of big bang nucleosynthesis (BBN) based on He-4 and Li-7 to allow for numbers of degrees of freedom which differ from the standard model value characterized by N-nu = 3. We use the two-dimensional likelihood functions to simultaneously constrain the baryon-to-photon ratio and the number of light neutrinos. The upper limit thus obtained is N-nu < 4.0 (at 95% C.L.). We also consider the consequences if recent observations of deuterium in high-redshift QSO absorption-line systems (QSOALS) are confirmed. (C) 1997 Elsevier Science B.V.

引用

页码：27 / 34

页数：8

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[1] SOME IMPLICATIONS OF A NEW VALUE FOR PRIMORDIAL SOLAR DEUTERIUM-HYDROGEN RATIO [J].