Collective neutrino flavor conversion: Recent developments

By S. Chakraborty, R. Hansen, I. Izaguirre, G. Raffelt. 2016

191 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/92d7eb662edc9385d6a53899c584713fddc0678f

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In Nuclear and High Energy Physics

1. R. Hansen
2. S. Chakraborty
3. I. Izaguirre
4. G. Raffelt
5. J. Redondo

Citations in the corpus

• Self-induced neutrino flavor conversion without flavor mixing (2016, background): “The effects of spatial [22–24, 34] and temporal [4, 35, 36] symmetry breaking as well as the possibility of fast flavor conversion [5, 6] have been taken as evidence for quick decoherence.”