Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-23
Phys.Rev.D77:113002,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
44 pages, 24 figures. Typo corrected in Eqs. (52, 68, 85 and 91) of the version published in PRD. Results unchanged
Scientific paper
10.1103/PhysRevD.77.113002
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/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 "e_3 - e_8 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.
Dasgupta Basudeb
Dighe Amol
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