Neutrino opacity for astrophysics

Neutrino interactions with dense matter dictate the long time evolution of compact remnants in core-collapse supernova (CCSN) and binary neutron star mergers (BNS). In this talk I will describe our work on neutrino opacity in the hot dense matter, which is suitable for use in astrophysical simulations of compact remnants. We include the nuclear medium corrections to the neutrino opacity, which is consistent with underlying nuclear equation of state (EOS). We also include a relaxation time scheme to account for medium corrections beyond conventional one-particle-hole excitation, which is not constrained by EOS.