Cosmological limits to the number of massive leptons

Details Cosmological limits to the number of massive leptons Cosmological limits to the number of massive leptons

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phlb...66..202s&link_type=abstract

Physics Letters B, Volume 66, Issue 2, p. 202-204.

Physics

199

Scientific paper

If massive leptons exist, their associated neutrinos would have been copiously produced in the early stages of the hot, big bang cosmology. These neutrinos would have contributed to the total energy density and would have had the effect of speeding up the expansion of the universe. The effect of the speed-up on primordial nucleosynthesis is to produce a higher abundance of 4He. It is shown that observational limits to the primordial abundance of 4He lead to the constraint that the total number of types of heavy lepton must be less than or equal to 5.

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