Constraints on the variation of the fine structure constant from big bang nucleosynthesis -: art. no. 045005

被引:114
作者
Bergström, L [1 ]
Iguri, S [1 ]
Rubinstein, H [1 ]
机构
[1] Univ Stockholm, Dept Phys, S-11385 Stockholm, Sweden
来源
PHYSICAL REVIEW D | 1999年 / 60卷 / 04期
关键词
D O I
10.1103/PhysRevD.60.045005
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We put bounds on the variation of the value of the fine structure constant alpha, at the time of big bang nucleosynthesis. We study carefully all light elements up to Li-7. We correct a previous upper limit on \Delta alpha/alpha\ estimated from He-4 primordial abundance and we find interesting new potential limits (depending on the value of the baryon-to-photon ratio) from Li-7, whose production is governed to a large extent by Coulomb barriers. The presently unclear observational situation concerning the primordial abundances precludes a better limit than \Delta alpha/alpha\ less than or similar to 2 X 10(-2), two orders of magnitude less restrictive than previous bounds. In fact, each of the (mutually exclusive) scenarios of standard big bang nucleosynthesis proposed, one based on a high value of the measured deuterium primordial abundance and one based on a low value, may describe some aspects of data better if a change in alpha of this magnitude is assumed. [S0556-2821(99)04414-8].
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页数:9
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