Can a neutrino-dominated Universe be rejected?

Details Can a neutrino-dominated Universe be rejected? Can a neutrino-dominated Universe be rejected?

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..637h&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, Aug. 23, 1984, p. 637-640.

Physics

47

Big Bang Cosmology, Neutrinos, Particle Theory, Universe, Galactic Evolution, Mass Distribution, Particle Mass, Radioactive Decay, Relic Radiation

Scientific paper

Current constraints on a neutrino-dominated universe are discussed. If the standard big-bang cosmology is correct, there must be two massive neutrino species. The heavier must have a mass in the range 0.1 MeV-0.25 GeV and must undergo decay on a time scale whose range is kept very narrow by upper limits on large-scale anisotropy in the microwave background and the requirement of a constant curvature initial fluctuation spectrum. The lighter neutrino must have a mass of order 30 eV and a very long lifetime. Cosmologies in which all neutrino species are stable give rise to coherent structures which are too large to be consistent with the observed galaxy distribution. There seems to be no natural reason why the parameters of real neutrinos should lie in the narrow ranges required to get a viable cosmology.

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