Role of dense matter in collective supernova neutrino transformations

Details Role of dense matter in collective supernova neutrino transformations Role of dense matter in collective supernova neutrino transformations

2008-07-07

arxiv.org/abs/0807.0659v2

Phys.Rev.D78:085012,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures. Published version

Scientific paper

10.1103/PhysRevD.78.085012

For neutrinos streaming from a supernova (SN) core, dense matter suppresses self-induced flavor transformations if the electron density n_e significantly exceeds the neutrino density n_nu in the conversion region. If n_e is comparable to n_nu one finds multi-angle decoherence, whereas the standard self-induced transformation behavior requires that in the transformation region n_nu is safely above n_e. This condition need not be satisfied in the early phase after supernova core bounce. Our new multi-angle effect is a subtle consequence of neutrinos traveling on different trajectories when streaming from a source that is not point-like.

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