H-dibaryons and Primordial Nucleosynthesis
Abstract
The apparent discrepancy between abundances of light nuclides predicted by the standard Big-Bang and observational data is explained, by assuming the presence of metastable H dibaryons at the nucleosynthesis era. These dibaryons could be formed out of a small fraction of strange quarks at the moment of the confinement transition. For a primordial deuterium abundance of the order of 3 10-5, the measured differences in the 4He abundances requires a relative abundance of H dibaryons of the order of nH/nB = 0.07, decaying in a timescale of the order of 105 s.
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