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Neutrino Scattering and Flavor Transformation in Supernovae

Neutrino Scattering and Flavor Transformation in Supernovae

We argue that the small fraction of neutrinos that undergo direction-changing scattering outside of the neutrinosphere could have significant influence on neutrino flavor transformation in core-collapse supernova environments. We show that the standard treatment for collective neutrino flavor transformation is adequate at late times but could be inadequate in early …