Calibration of the Advanced Spectral Leakage scheme for neutron star merger simulations, and extension to smoothed-particle hydrodynamics

ABSTRACT We calibrate a neutrino transport approximation, called Advanced Spectral Leakage (ASL), with the purpose of modelling neutrino-driven winds in neutron star mergers. Based on number snapshots, we gauge ASL parameters by comparing against both two-moment (M1) scheme implemented flash code and Monte Carlo sedonu. The contains three parameters, least robust which results to be blocking parameter for electron neutrinos antineutrinos. steering angular distribution heating is recalibrated compared earlier work. also present new, fast mesh-free algorithm calculating spectral optical depths, which, when using smoothed-particle hydrodynamics (SPH), makes completely particle-based. estimate speed-up factor ≳100 depth calculation grid-based approach. In suggested calibration recover luminosities mean energies within $25{{\ \rm per\ cent}}$. A comparison rates change internal energy fraction wind suggests comparable accuracies M1, but higher computational efficiency scheme. that ratio between CPU hours spent those ≲0.8 per time-step considering SPH magma2 as source Lagrangian hydrodynamics, 10 from M1 flash.