Primordial Nucleosynthesis in Inhomogeneous Universe
From recent studies of nucleosynthesis in inhomogeneous universe, It has been pointed out that 1) Ω B = 1 model becomes consistent with light element observations, 2) heavy elements including r-process elements are abundantly synthesized, and 3) 9Be plays a role of the indicator of inhomogeneity since 9Be is also abundantly synthesized. These suggestions were, however, based on a simple two-zone model in which back diffusion of neutrons are neglected during the nucleosynthesis. In this short review, It is shown that 1)the upper limit of Ω B which is consistent with light element observations is almost the same as that of homogeneous case, 2) the ‘Be abundance in the simple two-zone model is overestimated at least two orders of magnitude in plausible parameter space and 3) the abundances of CNO elements are very small in the proper range of baryon/photon ratio consistent with the abundances of light elements.
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