General-Relativistic Magnetohydrodynamics Effects in Neutron Star Mergers*

The postmerger evolution of binary neutron star systems determines to a large extent the qualitative and quantitative features of the electromagnetic emission and nucleosynthesis yields from these events. Multimessenger signals from neutron star merger remnants could constrain the properties of matter and gravity in otherwise inaccessible regimes. However, reliable theoretical models need to be developed in order to interpret and guide upcoming observations. This is challenging because of the rich physics and complex nonlinear magnetohydrodynamics phenomena that are expected to take place. This talk will review the current understanding of magnetohydrodynamics turbulence in neutron star mergers and its impact on their multimessenger signal. I will discuss the simulation techniques used to model the postmerger phase of binary neutron star mergers, highlighting recent progress and open problems.