Self-induced decoherence in dense neutrino gases

Details Self-induced decoherence in dense neutrino gases Self-induced decoherence in dense neutrino gases

2007-01-22

arxiv.org/abs/hep-ph/0701182v1

Phys.Rev.D75:083002,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, 16 pages, 12 figures

Scientific paper

10.1103/PhysRevD.75.083002

Dense neutrino gases exhibit collective oscillations where "self-maintained coherence" is a characteristic feature, i.e., neutrinos of different energies oscillate with the same frequency. In a non-isotropic gas, however, the flux term of the neutrino-neutrino interaction has the opposite effect of causing kinematical decoherence of neutrinos propagating in different directions, an effect that is at the origin of the "multi-angle behavior" of neutrinos streaming off a supernova core. We cast the equations of motion in a form where the role of the flux term is manifest. We study in detail the symmetric case of equal neutrino and antineutrino densities where the evolution consists of collective pair conversions ("bipolar oscillations"). A gas of this sort is unstable in that an infinitesimal anisotropy is enough to trigger a run-away towards flavor equipartition. The "self-maintained coherence" of a perfectly isotropic gas gives way to "self-induced decoherence."

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