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2019

Fast Neutrino Flavor Conversion: Collective Motion vs. Decoherence

Capozzi, Francesco, Raffelt, Georg, Stirner, Tobias

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In an interacting neutrino gas, flavor coherence becomes dynamical and can propagate as a collective mode.

In particular, tachyonic instabilities can appear, leading to "fast flavor conversion" that is independent of neutrino masses and mixing angles.
On the other hand, without neutrino-neutrino interaction, a prepared wave packet of flavor coherence simply dissipates by kinematical decoherence of infinitely many non-collective modes.
We reexamine the dispersion relation for fast flavor modes and show that for any wavenumber,there exists a continuum of non-collective modes besides a few discrete collective ones.

Fast Neutrino Flavor Conversion: Collective Motion vs. Decoherence · Around

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2019

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