Spectral split in prompt supernova neutrino burst: Analytic three-flavor treatment

Details Spectral split in prompt supernova neutrino burst: Analytic three-flavor treatment Spectral split in prompt supernova neutrino burst: Analytic three-flavor treatment

2008-01-10

arxiv.org/abs/0801.1660v2

Phys.Rev.D77:113007,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version (14 pages, 10 eps figures) to appear in Physical Review D. Text clarified, Figure 2 improved

Scientific paper

10.1103/PhysRevD.77.113007

The prompt nu_e burst from a core-collapse supernova (SN) is subject to both matter-induced flavor conversions and strong neutrino-neutrino refractive effects. For the lowest-mass progenitors, leading to O-Ne-Mg core SNe, the matter density profile can be so shallow that the usual MSW matter effects occur within the dense-neutrino region close to the neutrino sphere. In this case a ``split'' occurs in the emerging spectrum, i.e., the nu_e flavor survival probability shows a step-like feature. We explain this feature analytically as a ``MSW prepared spectral split.'' In a three-flavor treatment, the step-like feature actually consists of two narrowly spaced splits. They are determined by two combinations of flavor-lepton numbers that are conserved under collective oscillations.

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