On Lepton asymmetry and BBN

Details On Lepton asymmetry and BBN On Lepton asymmetry and BBN

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011prpnp..66..260k&link_type=abstract

Progress in Particle and Nuclear Physics, Volume 66, Issue 2, p. 260-265.

Physics

Nuclear Physics

Scientific paper

The strongest available cosmological constraint on lepton asymmetry is L<0.01. We discuss in more detail a BBN model with late νe↔νs oscillations which is capable of measuring extremely small lepton asymmetry, L>10-8. This sensitivity is achieved through the influence of small L on the neutrino oscillations, suppressing or enhancing them, and thus decreasing or increasing the primordially produced 4He. The cases of asymmetry generated by late resonant electron-sterile oscillations and relic lepton asymmetry are considered. The influence of L on nucleons freezing in pre-BBN epoch is numerically analyzed in the full range of the oscillation parameters for the model and L≥10-10.

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