Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe

Details Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe

1997-03-13

arxiv.org/abs/hep-ph/9703315v1

Nucl.Phys. B503 (1997) 426-444

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages including 6 figures. Latex.

Scientific paper

10.1016/S0550-3213(97)00479-3

Distortion of the equilibrium spectra of cosmic neutrinos due to interaction with hotter electrons and positrons in the primeval cosmic plasma is considered. The set of integro-differential kinetic equations for neutrinos is accurately numerically solved. The relative corrections to neutrino energy densities are approximately 0.9% for $\nu_e$ and 0.4% for $\nu_\mu$ and $\nu_\tau$. This effect results in $1.4 \cdot 10^{-4}$ increase in the primordial $^4 He$ abundance.

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