Neutrino counting with the supernova and the Big Bang

Details Neutrino counting with the supernova and the Big Bang Neutrino counting with the supernova and the Big Bang

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8725907s&link_type=abstract

Presented at the 22nd Recontres de Moriond: Electroweak Interactions and Unified Theories Conference, Les Arcs, France, 8 Mar. 1

Mathematics

Logic

Big Bang Cosmology, Counting, Neutrinos, Supernovae, Carbon, Helium, Lithium

Scientific paper

It is shown that the recent supernova in the Large Magellanic Cloud can be used to set a limit on the number of neutrino families to less than 7. For comparison the standard Big Bang nucleosynthesis arguments are reviewed. Using the primordial Helium as inferred from the He versus C correlations, and using the strengthened Li constraint, the cosmological limit is tightened such that three (or two) neutrino families fit well, but a fourth is beginning to be questionable, although it cannot be totally excluded.

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