Self-refraction of supernova neutrinos: mixed spectra and three-flavor instabilities

Details Self-refraction of supernova neutrinos: mixed spectra and three-flavor instabilities Self-refraction of supernova neutrinos: mixed spectra and three-flavor instabilities

2010-01-07

arxiv.org/abs/1001.0996v2

Phys.Rev.Lett.104:191102,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 5 figures; updated to match the PRL version

Scientific paper

10.1103/PhysRevLett.104.191102

Neutrinos in a core-collapse supernova undergo coherent flavor transformations in their own background. We explore this phenomenon during the cooling stage of the explosion. Our three-flavor calculations reveal qualitatively new effects compared to a two-flavor analysis. These effects are especially clearly seen for the inverted mass hierarchy: we find a different pattern of spectral "swaps" in the neutrino spectrum and a novel "mixed" spectrum for the antineutrinos. A brief discussion of the relevant physics is presented, including the instability of the two-flavor evolution trajectory, the 3-flavor pattern of spectral "swaps," and partial nonadiabaticity of the evolution.

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