H-dibaryons and Primordial Nucleosynthesis

Details H-dibaryons and Primordial Nucleosynthesis H-dibaryons and Primordial Nucleosynthesis

1998-10-19

arxiv.org/abs/astro-ph/9810283v1

Phys.Rev. D59 (1999) 027303

Astronomy and Astrophysics

Astrophysics

Latex, 5 pages, to appear in PRD

Scientific paper

10.1103/PhysRevD.59.027303

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 n_H/n_B = 0.07, decaying in a timescale of the order of 10^5 s.

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