Speaker
Wanil Park
Description
It will be shown that, even if Big Bang Nucleosynthesis constrains the asymmetry of electron neutrinos to be of or less than $\mathcal{O}(10^{-3})$, asymmetries of muon- and tau-neutrinos can be large and lead to $\Delta N_{\rm eff}=\mathcal{O}(0.1-1)$ as the number of extra neutrino species. Also, it will be shown that $\Delta N_{\rm eff}$ should be estimated from contributions of neutrino mass-eigenstates instead of neutrino flavor-eigenstates.
Author
Wanil Park
