Neutrino Luminosity and Matter-Induced Modification of Collective   Neutrino Flavor Oscillations in Supernovae
  We show that the bump in the electron number density profile at the base of the hydrogen envelope in O-Ne-Mg core-collapse supernovae causes an interesting interplay between neutrino-electron and neutrino-neutrino forward scattering effects in the flavor evolution of low-energy nu_e in the neutronization burst. The bump allows a significant fraction of the low-energy nu_e to survive by rendering their flavor evolution nonadiabatic. Increasing the luminosity of the neutronization burst shifts the bump-affected nu_e to lower energy with reduced survival probability. Similarly, lowering the luminosity shifts the bump-affected neutrinos to higher energies. While these low energy neutrinos lie near the edge of detectability, the population of bump-affected neutrinos has direct influence on the spectral swap formation in the neutrino signal at higher energies. 
John F. Cherry, Meng-Ru Wu, Joe Carlson, Huaiyu Duan, George M.   Fuller, Yong-Zhong Qian
astro-ph.HE astro-ph.SR hep-ph