Inhomogeneous Big Bang Nucleosynthesis and Mutual Ion Diffusion

Details Inhomogeneous Big Bang Nucleosynthesis and Mutual Ion Diffusion Inhomogeneous Big Bang Nucleosynthesis and Mutual Ion Diffusion

2002-04-26

arxiv.org/abs/astro-ph/0204459v2

Phys.Rev. D66 (2002) 043512

Astronomy and Astrophysics

Astrophysics

9 pages, minor changes to match the PRD version

Scientific paper

10.1103/PhysRevD.66.043512

We present a study of inhomogeneous big bang nucleosynthesis with emphasis on transport phenomena. We combine a hydrodynamic treatment to a nuclear reaction network and compute the light element abundances for a range of inhomogeneity parameters. We find that shortly after annihilation of electron-positron pairs, Thomson scattering on background photons prevents the diffusion of the remaining electrons. Protons and multiply charged ions then tend to diffuse into opposite directions so that no net charge is carried. Ions with Z>1 get enriched in the overdense regions, while protons diffuse out into regions of lower density. This leads to a second burst of nucleosynthesis in the overdense regions at T<20 keV, leading to enhanched destruction of deuterium and lithium. We find a region in the parameter space at 2.1E-10

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