Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model

Details Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.y6003l&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

This talk describes the evolution of a Big Bang Nucleosynthesis model with an inhomogeneous baryon distribution. The IBBN model is a spherically symmetric model with a high baryon density core and a low baryon density outer region. At an initial temperature T = 100 GK the model uses a high-to-low density contrast is R = 800.0 and the high density volume fraction fv = 1/8 as example values. Neutrons diffuse from the high density region to the low density region. Weak reactions convert some of the protons in the high density region into neutrons, which then diffuse to the low density region and get converted back to protons. Around T = 0.9 GK nucleosynthesis occurs slightly earlier in the core, depleting neutrons more rapidly. Neutrons then back diffuse from the outer region into the core. The degrees of neutron and proton diffusion and neutron back diffusion depend on when the diffusion length dl expands beyond the distance scale r_i. For a set baryon-to-photon ratio η_10 = 5.5 the talk shows how the value of ri affects neutron diffusion and determines the overall production of ^4He.

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