Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.136d2073e&link_type=abstract
Journal of Physics: Conference Series, Volume 136, Issue 4, pp. 042073 (2008).
Physics
Scientific paper
In the dense-neutrino region at 50-400 km above the neutrino sphere in a supernova, neutrino-neutrino interactions cause large flavor transformations. We study when the multi-angle nature of the neutrino trajectories leads to flavor decoherence between different angular modes. We consider a two-flavor mixing scenario between νe and another flavor νx and assume the usual hierarchy Fνc > Fνc > Fνx = Fνx for the number fluxes. We define epsilon = (Fνc - Fνe)/(Fνc - Fνx) as a measure for the deleptonization flux which is the one crucial parameter. The transition between the quasi single-angle behavior and multi-angle decoherence is abrupt as a function of e. For typical choices of other parameters, multi-angle decoherence is suppressed for epsilon gtrsim 0.3, but a much smaller asymmetry suffices if the neutrino mass hierarchy is normal and the mixing angle small. The critical e depends logarithmically on the neutrino luminosity. In a realistic supernova scenario, the deleptonization flux is probably enough to suppress multi-angle decoherence.
Esteban-Pretel Andreu
Pastor Sergio
Sigl Günter
Tomas Ricard
~Raffelt Georg G.
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