Exploring Fast Flavor Conversions in Three-Flavor Neutrino Systems

In recent years, neutrino fast flavor conversions (FFC) have received a lot of interest due to their critical role in extreme astrophysical environments, such as core-collapse supernovae and neutron star mergers. Many studies have relied on a two-flavor approximation to simplify the complex, non-linear nature of neutrino systems. However, recent findings suggest that muon production can induce a μ-τ asymmetry, necessitating a comprehensive three-flavor analysis for FFC.

In this talk, we present our numerical simulations of FFC in a one-dimensional dense neutrino gas, focusing on the full three-flavor system involving electron, muon, and tau neutrinos. Our results reveal new features absent in two-flavor models and demonstrate the impact of μ-τ asymmetry on flavor evolution. This work highlights the necessity of considering all three flavors to capture the full complexity of FFC and sets the stage for future studies of neutrino flavor oscillations.