Determination of Omega_b From Big Bang Nucleosynthesis in the Presence of Regions of Antimatter

Details Determination of Omega_b From Big Bang Nucleosynthesis in the Presence of Regions of Antimatter Determination of Omega_b From Big Bang Nucleosynthesis in the Presence of Regions of Antimatter

2001-01-15

arxiv.org/abs/astro-ph/0101236v4

Phys.Rev.D63:103001,2001

Astronomy and Astrophysics

Astrophysics

9 pages, PRD version, ref. 6 corrected

Scientific paper

10.1103/PhysRevD.63.103001

Production of regions of antimatter in the early universe is predicted in many baryogenesis models. Small scale antimatter regions would annihilate during or soon after nucleosynthesis, affecting the abundances of the light elements. In this paper we study how the acceptable range in Omega_b changes in the presence of antimatter regions, as compared to the standard big bang nucleosynthesis. It turns out that it is possible to produce at the same time both a low 4He value (Y_p < 0.240) and a low D/H value (D/H < 4e-5), but overproduction of 7Li is unavoidable at large Omega_b.

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