Role of dense matter in collective supernova neutrino transformations
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2008Vol. 78(8)
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Andreu Esteban-Pretel, Alessandro Mirizzi, S. Pastor, Roberto Tomás, Georg G. Raffelt, Pasquale Dario Serpico, G. Sigl
Abstract
For neutrinos streaming from a supernova core, dense matter suppresses self-induced flavor transformations if the electron density ${n}_{e}$ significantly exceeds the neutrino density ${n}_{\ensuremath{\nu}}$ in the conversion region. If ${n}_{e}$ is comparable to ${n}_{\ensuremath{\nu}}$, one finds multiangle decoherence, whereas the standard self-induced transformation behavior requires that in the transformation region ${n}_{\ensuremath{\nu}}$ is safely above ${n}_{e}$. This condition need not be satisfied in the early phase after the supernova core bounce. Our new multiangle effect is a subtle consequence of neutrinos traveling on different trajectories when streaming from a source that is not pointlike.
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