Moment equations of neutrinos in supernova

摘要: We derive a series of moment equations describing the motion and flavor transformation neutrinos in supernova. find particular moments neutrino density matrix The emission angle distribution is described by this moments. expand equation using these obtain equations. that have very good property convergence infinite can be truncated to with small set Using required computational power reduced about two orders magnitude compared multi-angle simulation. study on non-linear substantially simplified Two system also considered new polarization vectors are found.