Cosmological Neutrino Background Revisited

Details Cosmological Neutrino Background Revisited Cosmological Neutrino Background Revisited

1997-12-16

arxiv.org/abs/astro-ph/9712199v4

Astrophys.J. 509 (1998) 11-15

Astronomy and Astrophysics

Astrophysics

An error is corrected, figure revised; submitted to ApJ

Scientific paper

10.1086/306469

We solve the Boltzmann equation for cosmological neutrinos around the epoch of the electron-positron annihilation in order to verify the freeze-out approximation and to compute accurately the cosmological neutrino distribution function. We find the radiation energy density to be about 0.3% higher than the one predicted by the freeze-out approximation. As a result, the spectrum of the Cosmic Microwave Background anisotropies changes by 0.3-05%, depending on the angular scale, and the amplitude of the mass fluctuations on scales below about 100 h^{-1} Mpc decreases by about 0.2-0.3%.

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