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Self-Refraction of Supernova Neutrinos: Mixed Spectra and Three-Flavor Instabilities

Alexander Friedland
Phys. Rev. Lett. 104, 191102 – Published 11 May 2010
Physics logo See Synopsis: A full-flavored neutrino calculation
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Abstract

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 three-flavor pattern of spectral “swaps,” and partial nonadiabaticity of the evolution.

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  • Received 19 January 2010

DOI:https://doi.org/10.1103/PhysRevLett.104.191102

©2010 American Physical Society

Synopsis

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A full-flavored neutrino calculation

Published 24 May 2010

A new calculation of stellar core-collapse explosions that includes all three neutrino flavors shows unusual spectral patterns that will be important in understanding signals from future galactic supernovae.

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Authors & Affiliations

Alexander Friedland

  • Theoretical Division, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 104, Iss. 19 — 14 May 2010

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