Big Bang Nucleosynthesis
Abstract
In the first thousand seconds of its evolution the Universe was a primordial nuclear reactor synthesizing the nuclides D, 3He, 4He and 7Li. These messengers from the Big Bang provide a unique window on the early, hot, dense Universe, offering the opportunity for tests of the standard models of particle physics and of cosmology. A new, statistically coherent comparison of the primordial abundances of these nuclides inferred from increasingly accurate observational data with those predicted by the standard model hints at a possible crisis. The case for this emerging crisis is presented and several paths towards ameliorating it are explored.
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