期刊
NUCLEAR PHYSICS B
卷 590, 期 3, 页码 539-561出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0550-3213(00)00554-X
关键词
early Universe; neutrinos; lepton asymmetry; non-equilibrium kinetics
We calculate the exact kinetic evolution of cosmic neutrinos until complete decoupling, in the case when a large neutrino asymmetry exists. While not excluded by present observations, this large asymmetry can have relevant cosmological consequences and in particular may be helpful in reconciling Primordial Nucleosynthesis with a high baryon density as suggested by the most recent observations of the Cosmic Microwave Background Radiation. By solving numerically the Boltzmann kinetic equations for the neutrino distribution functions, we find the momentum-dependent corrections to the equilibrium spectra and briefly discuss their phenomenological implications. (C) 2000 Elsevier Science B.V, All rights reserved.
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