Neutrino rest mass from cosmology

Details Neutrino rest mass from cosmology Neutrino rest mass from cosmology

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..437s&link_type=abstract

Astronomy and Astrophysics, vol. 49, no. 3, June 1976, p. 437-441.

Astronomy and Astrophysics

Astrophysics

52

Big Bang Cosmology, Galactic Clusters, Galactic Evolution, Neutrinos, Particle Mass, Astronomical Models, Electrons, Gravitational Effects, Missing Mass (Astrophysics), Muons, Universe

Scientific paper

Observed values of Hubble's constant, the deceleration parameter, and the age of the Universe are used to compute an upper limit of 13.5 eV for the neutrino rest mass. It is suggested that the 'missing mass' phenomenon may be explained by relict cosmological neutrinos produce in the hot era following the big bang, if nonvanishing rest masses are assumed for electron and muon neutrinos. The history of the relict neutrinos during the evolution of the Universe is followed, and it is shown analytically that density fluctuations in the primordial neutrino gas at a temperature equal to the rest mass may initiate the formation of clusters of galaxies. It is concluded that the most accurate upper limits on neutrino rest mass can be determined by observing the gravity of relict cosmological neutrinos. It is noted that a rest mass greater than about 15 eV would be incompatible with astrophysical evidence.

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