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Published online by Cambridge University Press: 06 November 2008
Primordial nucleosynthesis is one of the three observational evidences for the Big–Bang model. Even though they span a range of nine orders ofmagnitude, there is indeed a good overall agreement between primordial abundances of 4He, D, 3He and 7Li either deduced from observation or primordialnucleosynthesis. This comparison was used for the determination ofthe baryonic density of the Universe. For this purpose, it is now superseded by the analysis of the CMB anisotropies. Big–Bang nucleosynthesis remains, nevertheless, a valuable tool to probethe physics of the early Universe.