Constructing angular distributions of neutrinos in core collapse supernova from zero-th and first moments calibrated by full Boltzmann neutrino transport

Understand

Two-moment neutrino transport methods have been widely used for developing theoretical models of core-collapse supernova (CCSN), since they substantially reduce the computational burden inherent in the multi-dimensional neutrino-radiation hydrodynamical simulations.

• The approximation, however, comes at a price; the detailed structure of angular distribution of neutrinos is sacrificed, that is the main drawback of this approach.
• In this paper, we develop a novel method by which to construct angular distributions of neutrinos from the zero-th and first angular moments.
• In our method, the angular distribution is expressed with two quadratic functions of the neutrino angle in a piecewise fashion.