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High Energy Physics - Phenomenology, hep-ph, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
Abstract:
Neutrino flavor evolution in core-collapse supernovae, neutron-star mergers,
or the early universe is dominated by neutrino-neutrino refraction, often
spawning "self-induced flavor conversion", i.e., shuffling of flavor among
momentum modes. This effect is driven by collective run-away modes of the
coupled "flavor oscillators" and can spontaneously break the initial symmetries
such as axial symmetry, homogeneity, isotropy, and even stationarity. Moreover,
the growth rates of unstable modes can be of the order of the neutrino-neutrino
interaction energy instead of the much smaller vacuum oscillation frequency:
self-induced flavor conversion does not always require neutrino masses. We
illustrate these newly found phenomena in terms of simple toy models. What
happens in realistic astrophysical settings is up to speculation at present.
