Non equilibrium spectra of degenerate relic neutrinos

Details Non equilibrium spectra of degenerate relic neutrinos Non equilibrium spectra of degenerate relic neutrinos

2000-05-30

arxiv.org/abs/astro-ph/0005573v2

Nucl.Phys. B590 (2000) 539-561

Astronomy and Astrophysics

Astrophysics

30 pages, 17 figures, version to be published

Scientific paper

10.1016/S0550-3213(00)00554-X

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.

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