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The neutrino spectral split in core-collapse supernovae: a magnetic resonance phenomenon

Abstract : A variety of neutrino flavour conversion phenomena occur in core-collapse supernova, due to the large neutrino density close to the neutrinosphere, and the importance of the neutrino-neutrino interaction. Three different regimes have been identified so far, usually called the synchronization, the bipolar oscillations and the spectral split. Using the formalism of polarization vectors, within two-flavours, we focus on the spectral split phenomenon and we show for the first time that the underlying physical mechanism engendering the split can be understood as a magnetic resonance phenomenon. In particular, we show that the precession frequencies satisfy the condition for the occurrence of such a resonance. Our numerical calculations show that the energies at which the resonance takes place coincide well with the neutrino energies at which a spectral swap occurs. The corresponding adiabaticity parameters present spikes at the resonance location.
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http://hal.in2p3.fr/in2p3-00597556
Contributor : Sophie Heurteau <>
Submitted on : Wednesday, June 1, 2011 - 1:17:56 PM
Last modification on : Monday, December 14, 2020 - 4:16:02 PM

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S. Galais, C. Volpe. The neutrino spectral split in core-collapse supernovae: a magnetic resonance phenomenon. Physical Review C, American Physical Society, 2011, 84, pp.085005. ⟨10.1103/PhysRevD.84.085005⟩. ⟨in2p3-00597556⟩

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