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We re-examine the evolution of neutrino asymmetries in several four neutrinomodels. The first case involves the direct creation of $L_{\nu_e}$ by $\nu_e\leftrightarrow \nu_s$ oscillations. In the second case, we consider the masshierarchy $m_{\nu_\tau} \gg m_{\nu_\mu}, m_{\nu_e}, m_{\nu_s}$ where $\nu_\tau\leftrightarrow \nu_s$ oscillations generate a large $L_{\nu_\tau}$ and some ofthis asymmetry is converted into $L_{\nu_e}$ by $\nu_{\tau} \leftrightarrow\nu_{e}$ oscillations. We estimate the implications for BBN for a range ofcosmologically interesting $\delta m^2$ values. The present paper improves onprevious published work by taking into account the finite repopulation rate andthe time dependence of the distortions to the neutrino momentum distributions.The treatment of chemical decoupling is also improved.Comment: Expanded discussion on the sign of the neutrino asymmetr

Detailed study of BBN implications of neutrino oscillation generated neutrino asymmetries in some four neutrino models