Patching Up the Lithium Problem - Neutrino Degeneracy to the Rescue?

Details Patching Up the Lithium Problem - Neutrino Degeneracy to the Rescue? Patching Up the Lithium Problem - Neutrino Degeneracy to the Rescue?

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..4cf.s8006t&link_type=abstract

American Physical Society, Four Corners Meeting, 2003, October 24-25, 2003 Arizona State University, Tempe, Arizona, MEETING ID:

Physics

Scientific paper

Recent measurements of the primordial deuterium abundance in high-redshift clouds toward several several QSOs allow the baryon-to-photon ratio to be accurately pegged. With the baryon-to-photon ratio in hand, standard BBN theory can now make tight predictions for the light element abundances coming out of big bang nucleosynthesis. At the deuterium-set baryon-to-photon ratio, the predicted primeval Li-7 abundance is arguably a factor of three to four larger than that observed in metal-poor halo stars. At present, it is unclear if lithium depletion in these old Population II stars can account for the wide disparity. In this work, we consider how the gap between predicted and observed Li-7 abundances may be narrowed by allowing for neutrino degeneracy. Using the BBN code of Kawano, we find that a positive and equal degeneracy in each of the neutrino species can lower the predicted Li-7/H yield, thus patching up the lithium problem.

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