More on big-bang nucleosynthesis with nonzero lepton numbers

Details More on big-bang nucleosynthesis with nonzero lepton numbers More on big-bang nucleosynthesis with nonzero lepton numbers

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..253b&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 253-262. Research supported by the U.S.-Israel Binational Science Fo

Astronomy and Astrophysics

Astrophysics

28

Abundance, Big Bang Cosmology, Leptons, Nuclear Fusion, Deuterium, Helium Isotopes, Lithium Isotopes, Universe

Scientific paper

The calculation of big-bang nucleosynthesis with nonzero lepton numbers is extended to atomic weights less than 12. The observed abundances of D and He-4 place only a lower limit on the present mean baryon density of the Universe: not less than 5 x 10 to the -31st g/cu cm for primordial D/H equals .000014 by number (assuming no astration), and not less than 3.5 x 10 to the -31st g/cu cm if the primordial abundance was twice as high, and half of it has been destroyed in stars. In the case of astration, primordial Li-7 can account at most for only about 25 percent of the observed abundance (15 percent for zero lepton numbers).

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