Binary neutron star merger simulations with neutrino transport and turbulent viscosity: impact of different schemes and grid resolution

Understand

We present a systematic numerical relativity study of the impact of different treatment of microphysics and grid resolution in binary neutron star mergers.

• We consider series of simulations at multiple resolutions comparing hydrodynamics, neutrino leakage scheme, leakage augmented with the M0 scheme and the more consistent M1 transport scheme.
• Additionally, we consider the impact of a sub-grid scheme for turbulent viscosity.
• We find that viscosity helps to stabilise the remnant against gravitational collapse but grid resolution has a larger impact than microphysics on the remnant's stability.