Testing the Friedmann equation: The expansion of the universe during big-bang nucleosynthesis

被引:57
作者
Carroll, SM [1 ]
Kaplinghat, M
机构
[1] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
[2] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[3] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
来源
PHYSICAL REVIEW D | 2002年 / 65卷 / 06期
关键词
D O I
10.1103/PhysRevD.65.063507
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In conventional general relativity, the expansion rate H of a Robertson-Walker universe is related to the energy density by the Friedmann equation. Aside from the present day, the only epoch at which we can constrain the expansion history in a model-independent way is during big-bang nucleosynthesis (BBN). We consider a simple two-parameter characterization of the behavior of H during BBN and derive constraints on this parameter space, finding that the allowed region of parameter space is essentially one dimensional. We also study the effects of a large neutrino asymmetry within this framework. Our results provide a simple way to compare an alternative cosmology to the observational requirement of matching the primordial abundances of the light elements.
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页数:8
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