Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos
Cosmological lepton asymmetry, primordial nucleosynthesis and sterile neutrinos
We study post weak decoupling coherent active-sterile and active-active matter-enhanced neutrino flavor transformation in the early Universe. We show that flavor conversion efficiency at Mikheyev-Smirnov-Wolfenstein resonances is likely to be high (adiabatic evolution) for relevant neutrino parameters and energies. However, we point out that these resonances cannot sweep smoothly and …