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Decoherence by wave packet separation and collective neutrino oscillations

MPG-Autoren
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Akhmedov,  Evgeny Kh.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Kopp,  Joachim
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Lindner,  Manfred
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Volltexte (frei zugänglich)

1405.7275.pdf
(Preprint), 617KB

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Zitation

Akhmedov, E. K., Kopp, J., & Lindner, M. (2015). Decoherence by wave packet separation and collective neutrino oscillations. Retrieved from http://arxiv.org/abs/1405.7275.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0029-3509-6
Zusammenfassung
In dense neutrino backgrounds present in supernovae and in the early Universe, neutrino oscillations may exhibit complex collective phenomena, such as synchronized oscillations, bipolar oscillations and spectral splits and swaps. In this Letter we consider for the first time the effects of decoherence by wave packet separation on these phenomena. We derive the evolution equations that govern neutrino oscillations in a dense medium in the presence of decoherence and consider the evolution of several simple neutrino systems in detail. We show that decoherence may modify the oscillation pattern significantly and lead to qualitatively new effects. In particular, contrary to the no-decoherence case, strong flavor conversion becomes possible even in the case of constant or nearly constant density of the neutrino background.