Does neutrino flavor conversion change supernova explosion outcomes?
In plain words
Neutrinos come in three types (flavors) and, in the dense core, they can switch type collectively, which may change how much energy they deposit behind the shock.
Precise statement
In the neutrino-decoupling region, neutrino-neutrino forward scattering drives fast flavor instabilities wherever the electron-lepton-number angular distribution has a crossing. Determine whether including flavor conversion self-consistently in multi-dimensional simulations changes shock-revival time, explosion energy or ejecta electron fraction by more than $\sim 10$ percent. Answer: yes or no with quantified effects for representative progenitors.
What would settle it
Multi-dimensional simulations with validated subgrid or direct flavor-evolution schemes, compared with runs without conversion.
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