title: Self-induced suppression of collective neutrino oscillations in a supernova.
abstract: We investigate collective flavor oscillations of supernova neutrinos at late stages of the explosion. We first show that the frequently used single-angle (averaged coupling) approximation predicts oscillations close to, or perhaps even inside, the neutrinosphere, potentially invalidating the basic neutrino transport paradigm. Fortunately, we also find that the single-angle approximation breaks down in this regime; in the full multiangle calculation, the oscillations start safely outside the transport region. The new suppression effect is traced to the interplay between the dispersion in the neutrino-neutrino interactions and the vacuum oscillation term.
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, New Mexico 87545, USA.
authors.forename: Huaiyu
authors.initials: H
authors.lastname: Duan
authors.forename: Alexander
authors.initials: A
authors.lastname: Friedland