Synchronization vs. decoherence of neutrino oscillations at intermediate densities

Details Synchronization vs. decoherence of neutrino oscillations at intermediate densities Synchronization vs. decoherence of neutrino oscillations at intermediate densities

2010-05-31

arxiv.org/abs/1006.0002v2

Phys.Rev.D82:125004,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, including 13 figures. Clarifying paragraphs and 2 figures added; results unchanged. Matches published version in PRD

Scientific paper

10.1103/PhysRevD.82.125004

We study collective oscillations of a two-flavor neutrino system with arbitrary but fixed density. In the vacuum limit, modes with different energies quickly de-phase (kinematical decoherence), whereas in the limit of infinite density they lock to each other (synchronization). For intermediate densities, we find different classes of solutions. There is always a phase transition in the sense of partial synchronization occurring only above a density threshold. For small mixing angles, partial or complete decoherence can be induced by a parametric resonance, introducing a new time scale to the problem, the final outcome depending on the spectrum and mixing angle. We derive an analytic relation that allows us to calculate the late-time degree of coherence based on the spectrum alone.

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