Expanding the Capabilities of a Big Bang Nucleosynthesis Code

Details Expanding the Capabilities of a Big Bang Nucleosynthesis Code Expanding the Capabilities of a Big Bang Nucleosynthesis Code

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..aprq16001l&link_type=abstract

American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #Q16.001

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In 1993 the author inherited a Big Bang Nucleosynthesis code written by Tony Rothman and Richard Matzner of the University of Texas at Austin. The original code was for an isotropic, homogeneous universe and it calculated abundances for nine light isotope species. The author expanded this Texas code's isotope network to 68 species to confirm the results for the light species and learn what abundances for heavier species would be produced by Big Bang Nucleosynthesis. A suggested comparison of this code with a large network code from another research group determined modifications the Texas code needed to run more accurately and efficiently. The author then added sections that determined the change of the abundances resulting from neutrinoes transferring energy to electrons and positrons, and extended the Big Bang Nucleosynthesis code to an inhomogeneous model of the universe that included the neutrino heating effect as well. The results of the work done on the codes will be explained using graphs of individual reactions: nuclear reactions between heavy isotopes, weak reactions between neutrinoes and electrons/positrons, and neutron diffusion between different locations in space in the inhomogeneous model to elucidate the fundamental physics underlying the somewhat complicated results.

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