Stability of three neutrino flavor conversion in supernovae

Neutrino-neutrino interactions can lead to collective flavor conversion in the dense parts of a core collapse supernova. Growing instabilities that lead to collective conversions have been studied intensely in the limit of two-neutrino species and occur for inverted mass ordering in the case of a pe...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2019-08, Vol.2019 (8), p.3-3, Article 003
Main Authors: Döring, Christian, Hansen, Rasmus S.L., Lindner, Manfred
Format: Article
Language:English
Subjects:
Conversion
Flavors
Growth rate
Neutrino beams
Neutrinos
Supernovae
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Summary:Neutrino-neutrino interactions can lead to collective flavor conversion in the dense parts of a core collapse supernova. Growing instabilities that lead to collective conversions have been studied intensely in the limit of two-neutrino species and occur for inverted mass ordering in the case of a perfectly spherical supernova. We examine two simple models of colliding and intersecting neutrino beams and show, that for three neutrino species instabilities exist also for normal mass ordering even in the case of a fully symmetric system. Whereas the instability for inverted mass ordering is associated with Δm312, the new instability we find for normal mass ordering is associated with Δm212. As a consequence, the growth rate of these new instabilities for normal ordering is smaller by about an order of magnitude compared to the rates of the well studied case of inverted ordering.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2019/08/003