High-accuracy simulations of highly spinning binary neutron star systems

Understand

With an increasing number of expected gravitational-wave detections of binary neutron star mergers, it is essential that gravitational-wave models employed for the analysis of observational data are able to describe generic compact binary systems.

• This includes systems in which the individual neutron stars are millisecond pulsars for which spin effects become essential.
• In this work, we perform numerical-relativity simulations of binary neutron stars with aligned and anti-aligned spins within a range of dimensionless spins of $\chi \sim [-0.28,0.58]$.
• The simulations are performed with multiple resolutions, show a clear convergence order and, consequently, can be used to test existing waveform approximants.