Lepton number survival in the cosmic neutrino background
Lepton number survival in the cosmic neutrino background
The hot big bang model predicts the existence of a cosmic neutrino background. The number of particles and antiparticles in this primordial bath of neutrinos can be different---a memory of processes that took place at very early epochs. If neutrinos were massless, this asymmetry would not change once neutrinos froze …