Core-collapse supernova simulations with the multiangle subgrid modeling of fast neutrino flavor conversion and the gravitational wave signatures

Abstract

Fast neutrino flavor conversion is a crucial yet poorly understood process in core-collapse supernovae due to its dependence on neutrino angular distributions and the microscopic scales. In this study, I present the general relativistic multiangle Boltzmann neutrino radiation hydrodynamics simulations incorporating a quantum-kinetically motivated subgrid model based on the Bhatnagar–Gross–Krook relaxation scheme. First, a comparative testing of various subgrid methodologies in 1D simulations is performed, validating the robustness of the angular-dependent approach against simpler models. Furthermore, following the recent findings that the flavor conversion exerts a bifurcated impact on shock revival, I investigate how these flavor conversion induced changes affect the resulting gravitational wave signatures. The analysis shows that the flavor conversion can indeed affect the high-frequency gravitational wave emission. In particular, an equation of state dependent suppression of the high-frequency ( ≳600Hz) gravitational wave power is identified.