Nucleosynthesis in the low-entropy and lepton-degenerate universe

Details Nucleosynthesis in the low-entropy and lepton-degenerate universe Nucleosynthesis in the low-entropy and lepton-degenerate universe

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294....9t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 9-16.

Astronomy and Astrophysics

Astrophysics

26

Baryons, Big Bang Cosmology, Heavy Elements, Leptons, Nuclear Fusion, Photons, Abundance, Deuterium, Stellar Evolution

Scientific paper

Primordial nucleosynthesis in a cold or tepid universe is examined in the wide range of baryon/photon ratios (3 x 10 to the -6th - 15) and lepton/baryon ratios (1 - 10 to the 5th). In particular, synthesis of heavy elements is investigated in detail, by taking into account entropy production due to nucleosynthesis and nonequilibrium beta processes. The following results are obtained: (1) synthesis of heavy elements imposes stringent constraints on the baryon/photon and lepton/baryon ratios; in particular, it becomes clear from this result that the cold universe with a baryon/photon ratio of 10 to the -4th should be ruled out; (2) heavy elements are synthesized abundantly if lepton degeneracy is weak; especially, the elements C-12, C-13, N-14, O-16, Na-22, and Al-26 are abundantly synthesized.

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