Toward Binary Neutron Star Simulations with MaNGa

The modeling of binary neutron star mergers is central to interpreting multimessenger observations in the era of precision gravitational-wave astronomy. We present progress toward a fully general-relativistic hydrodynamics framework that couples the moving-mesh code MaNGa to BlackHoles@Home, a finite-difference spacetime solver capable of performing dynamical evolutions in curvilinear coordinates. MaNGa employs an arbitrary Lagrangian–Eulerian scheme based on Voronoi tessellation, combining the shock-capturing strength of grid-based solvers with the adaptivity of Lagrangian methods. We have validated fully coupled evolutions of static and boosted neutron stars, demonstrating the numerical stability and robustness of the combined MaNGa–BlackHoles@Home system. A new communication strategy between the two codes has been implemented to improve scalability and parallel efficiency. We also report on ongoing simulations of head-on neutron star collisions, with future developments aimed at extending the framework to the multi-patch version of BlackHoles@Home for efficient binary neutron star merger simulations.