Collective three-flavor oscillations of supernova neutrinos

Dasgupta, Basudeb ; Dighe, Amol (2008) Collective three-flavor oscillations of supernova neutrinos Physical Review D, 77 (11). Article ID 113002. ISSN 1550-7998

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Neutrinos and antineutrinos emitted from a core collapse supernova interact among themselves, giving rise to collective flavor conversion effects that are significant near the neutrinosphere. We develop a formalism to analyze these collective effects in the complete three-flavor framework. It naturally generalizes the spin-precession analogy to three flavors and is capable of analytically describing phenomena like vacuum/Mikheyev-Smirnov-Wolfenstein (MSW) oscillations, synchronized oscillations, bipolar oscillations, and spectral split. Using the formalism, we demonstrate that the flavor conversions may be “factorized” into two-flavor oscillations with hierarchical frequencies. We explicitly show how the three-flavor solution may be constructed by combining two-flavor solutions. For a typical supernova density profile, we identify an approximate separation of regions where distinctly different flavor conversion mechanisms operate, and demonstrate the interplay between collective and MSW effects. We pictorialize our results in terms of the “e3−e8 triangle” diagram, which is a tool that can be used to visualize three-neutrino flavor conversions in general, and offers insights into the analysis of the collective effects in particular.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:101399
Deposited On:09 Mar 2018 10:24
Last Modified:09 Mar 2018 10:24

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