Cosmological Neutrino Background Revisited | Zendy

Nickolay Y. Gnedin | Zendy; Oleg Y. Gnedin | Zendy

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Cosmological Neutrino Background Revisited

Author(s) -

Nickolay Y. Gnedin,

Oleg Y. Gnedin

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306469

Subject(s) - physics , cosmic microwave background , neutrino , astrophysics , background radiation , cosmology , cosmic background radiation , cosmic neutrino background , amplitude , boltzmann equation , spectral density , universe , anisotropy , particle physics , radiation , neutrino detector , neutrino oscillation , nuclear physics , quantum mechanics , statistics , mathematics

We solve the Boltzmann equation for cosmological neutrinos around the epochof the electron-positron annihilation in order to verify the freeze-outapproximation and to compute accurately the cosmological neutrino distributionfunction. We find the radiation energy density to be about 0.3% higher than theone predicted by the freeze-out approximation. As a result, the spectrum of theCosmic Microwave Background anisotropies changes by 0.3-05%, depending on theangular scale, and the amplitude of the mass fluctuations on scales below about100 h^{-1} Mpc decreases by about 0.2-0.3%.Comment: An error is corrected, figure revised; submitted to Ap

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