Abstract
In this article we consider the relations which exist between the properties of the neutrino, a manifestation of Nature on its smallest scale, and on its largest scale the behaviour of the Universe as a whole. The Hot Big Bang theory describes the thermal history of the Universe, during which the lepton era was particularly important with regard to weak interaction physics and the predicted neutrino processes. Possible modifications of the theory of weak interactions change these processes and the cosmological rôle of the neutrinos. We give several possible estimates and upper limit values for the neutrino energy density, which can be obtained from the cosmological model and experimental data.
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