H dibaryons and primordial nucleosynthesis - art. no. 027303

The apparent discrepancy between abundances of light nuclides predicted by the standard big bang and observational data is explained by assuming the p resence of metastable H dibaryons at the nucleosynthesis era. These dibaryo ns 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 x 10(-5), the measured differences in the He-4 abundances requir es a relative abundance of H dibaryons of the order of n(H)/n(B) similar to 0.07, decaying in a time scale of the order of 10(5) s. [S0556-2821(99)025 02-3].