A multi-dimensional implementation of the Advanced Spectral neutrino Leakage scheme

Abstract

We present a new, multi-dimensional implementation of the Advanced Spectral Leakage (ASL) scheme with the purpose of modelling neutrino-matter interactions in neutron star mergers. A major challenge is the neutrino absorption in the semi-transparent regime, which is responsible for driving winds from the merger remnant. The composition of such winds is crucial in the understanding of the electromagnetic emission in the recently observed macronova following GW170817. Compared to the original version, we introduce an optical-depth-dependent flux factor to model the average angle of neutrino propagation, and a modulation that accounts for flux anisotropies in non-spherical geometries. We scrutinise our approach by first comparing the new scheme against the original one for a spherically symmetric core-collapse supernova snapshot, both in 1D and in 3D, and additionally against a two-moment (M1) scheme as implemented in 1D into the code GR1D. The luminosities and mean energies agree to a few percents in most tests. Finally, for the case of a binary merger remnant snapshot we compare the new ASL scheme with the M1 scheme that is implemented in the Eulerian adaptive mesh refinement code FLASH. We find that the neutrino absorption distribution in the semi-transparent regime is overall well reproduced. Both approaches agree to within $\lesssim 15\%$ for the average energies and to better than $\sim 35\%$ in the total luminosities.

arXiv commentv.2, minor corrections, accepted for publication in MNRAS

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• Numerical Relativity Simulations of the Neutron Star Merger GW170817: Long-Term Remnant Evolutions, Winds, Remnant Disks, and Nucleosynthesis
• Neutrino transport in general relativistic neutron star merger simulations
• Neutrino absorption and other physics dependencies in neutrino-cooled black-hole accretion disks
• Neutrino emission from binary neutron star mergers: characterizing light curves and mean energies
• Neutrino fast flavor oscillations with moments: linear stability analysis and application to neutron star mergers
• Two-Moment Neutrino Flavor Transformation with applications to the Fast Flavor Instability in Neutron Star Mergers
• Rank-3 Moment Closures in General Relativistic Neutrino Transport
• Simulating neutron star mergers with the Lagrangian Numerical Relativity code SPHINCS_BSSN
• Calibration of the Advanced Spectral Leakage scheme for neutron star merger simulations, and extension to smoothed-particle hydrodynamics
• Relativistic radiation hydrodynamics in a reference-metric formulation
• Incorporating a radiative hydrodynamics scheme in the numerical-relativity code BAM