A Comparison of Boltzmann and Multigroup Flux‐limited Diffusion Neutrino Transport during the Postbounce Shock Reheating Phase in Core‐Collapse Supernovae

Abstract

We compare Newtonian three-avor multigroup Boltzmann (MGBT) and (Bruenns) multigroup uxlimited di usion (MGFLD) neutrino transport in postbounce core-collapse supernova environments. We focus our study on quantities central to the postbounce neutrino heating mechanism for reviving the stalled shock. Stationary-state three-avor neutrino distributions are developed in thermally and hydrodynamically frozen time slices obtained from core collapse and bounce simulations that implement Lagrangian hydrodynamics and MGFLD neutrino transport. We obtain distributions for time slices at 106 and 233 ms after core bounce for the core of a 15