Nucleosynthesis, Age of the Universe, and Nuclear Astrophysics 2.Big-Bang Nucleosynthesis and Cosmology
نویسندگان
چکیده
منابع مشابه
Big-bang Nucleosynthesis Predictions for Precision Cosmology
The determination of the primeval deuterium abundance has opened a precision era in big-bang nucleosynthesis (BBN), making accurate predictions more important than ever before. We present in analytic form new, more precise predictions for the light-element abundances and their error matrix. Using our predictions and the primeval deuterium abundance we infer a baryon density of Bh = 0:020 0:002 ...
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A review of the latest measurements of the primordial abundances of the light nuclei D, He, He and Li is given. We discuss in particular the primordial abundance Yp of He as measured in blue compact dwarf galaxies. We argue that the best measurements now give a “high” value of Yp along with a “low” value of D/H, and that the two independent measurements are consistent within the framework of st...
متن کاملBig-bang nucleosynthesis and the baryon density of the universe.
For almost 30 years, the predictions of big-bang nucleosynthesis have been used to test the big-bang model to within a fraction of a second of the bang. The agreement between the predicted and observed abundances of deuterium, helium-3, helium-4, and lithium-7 confirms the standard cosmology model and allows accurate determination of the baryon density, between 1.7 x 10(-31) and 4.1 x 10(-31) g...
متن کاملThe Expansion of the Universe During Big-Bang Nucleosynthesis
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 d...
متن کاملSome Key Questions in Early Universe Cosmology and Big Bang Nucleosynthesis
For all the interesting possible phenomena which might have occurred during the early universe, there are really only two observational cosmological probes. Of those two, the only probe during the relevant radiation dominated epoch is the yield of light elements during the epoch of big bang nucleosynthesis. The synthesis of light elements occurs in the temperature regime from 108 to 1010 K and ...
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ژورنال
عنوان ژورنال: Journal of Plasma and Fusion Research
سال: 2003
ISSN: 0918-7928
DOI: 10.1585/jspf.79.855