Simulating neutron star merger remnant outflows with a two-moment neutrino scheme

The multimessenger nature of neutron star (NS) mergers gives us a unique opportunity to study nuclear and plasma astrophysics in an unusually controlled environment. To meaningfully interpret the observations, I provide a framework to evolve the NS merger since the moment just before the merger until the production of magnetized relativistic jets. I developed a two-moment (M1) neutrino transport scheme, where the backreaction of the neutrinos on the gas is treated implicitly (required in the regions with high optical depth to neutrino absorption) and the matter-neutrino interactions are included via lookup table, produced by an open-source library NuLib. Here, I present the results of the first simulation of a black hole - neutron star merger with M1 neutrino transport, initialized with the results of a numerical relativity simulation 20 ms after the merger, with neutrino transport and realistic equation of state (Helmholtz EOS), using a general relativistic magnetohydrodynamic code H-AMR.