Big bang nucleosynthesis and the quark-hadron transition

Details Big bang nucleosynthesis and the quark-hadron transition Big bang nucleosynthesis and the quark-hadron transition

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..406k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 406-410. Previously announced in STAR as N90-14168.

Mathematics

Logic

80

Astronomical Models, Big Bang Cosmology, Hadrons, Nuclear Fusion, Particle Interactions, Phase Transformations, Quarks, Abundance, Boundary Value Problems, Density Distribution

Scientific paper

An examination and brief review is made of the effects of quark-hadron transition 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 Nnu 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 10e, whereas the simplest models for the transition seem to restrict R to less than of approximately 102.

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