Big Bang Nucleosynthesis and the Quark-Hadron Transition

Download or read book Big Bang Nucleosynthesis and the Quark-Hadron Transition written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An examination and brief review is made of the effects of quark-hadron transistion induced fluctuations on Big Bang nucleosynthesis. It is shown that cosmologically critical densities in baryons are difficult to reconcile with observation, but the traditional baryon density constraints from homogeneous calculations might be loosened by as much as 50 percent, to 0.3 of critical density, and the limit on the number of neutrino flavors remains about N(sub nu) is less than or approximately 4. To achieve baryon densities of greater than or approximately 0.3 of critical density would require initial density contrasts R is much greater the 10(exp 3), whereas the simplest models for the transition seem to restrict R to less than of approximately 10(exp 2). Kurki-Suonio, Hannu and Matzner, Richard A. and Olive, Keith A. and Schramm, David N. Unspecified Center NASA-CR-186169, NAS 1.26:186169, FERMILAB-PUB-89/252-A NAGW-1340...