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NEUTRINO SPECTRUM DISTORTION DUE TO OSCILLATIONS AND ITS BBN EFFECT

DANIELA KIRILOVA

Institute of Astronomy, Sofia and Physique Theorique, ULB, Bruxelles, Belgium

https://doi.org/10.1142/S0218271804004906Cited by:10 (Source: Crossref)

Abstract

We study the distortion of electron neutrino energy spectrum due to oscillations with the sterile neutrino ν_e↔ν_s, for different initial populations of the sterile state δN_s at the onset of oscillations. The influence of this spectrum distortion on Big Bang Nucleosynthesis is analyzed. Only the case of an initially empty sterile state was studied in previous publications.

The primordial abundance of ⁴He is calculated for all possible δN_s:0≤δN_s≤1 in the model of oscillations, effective after electron neutrino decoupling, for which the spectrum distortion effects on the neutron–proton transitions are the strongest.

It is found that the spectrum distortion effect may be dominant, not only in the case of small δN_s, but also in the case of large initial population of ν_s. For example, in the resonant case it may play a considerable role even for very large δN_s~0.8. Cosmological constraints on neutrino mixing for small δN_s are discussed.

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