The Effect of the Fast-Flavor Instability on Core-Collapse Supernova Models

Understand

Merging our supernova code F{\sc{ornax}} with the Box3D fast-flavor neutrino oscillation formalism, we explore the effects of fast-flavor conversion (FFC) in state-of-the-art 1D and 2D core-collapse supernova simulations.

• We find that after a few tens of milliseconds after bounce the FFC emerges just interior to and exterior to the stalled shock wave.
• It does not obtain in the PNS core nor near the average neutrinosphere radii.
• Interior to the shock, this results in a temporary change in the net neutrino heating rate of $\sim$10\%, due mostly to a hardening of the $\nu_e$ and $\bar{\nu}_e$ neutrino spectra, despite the decrease in their corresponding neutrino number fluxes.