Simulations of Binary Neutron Stars with Spin. A Comparison of the Einstein Toolkit (Cactus) and BAM.

We are simulating the inspiral, merger, and post-merger phases of Binary Neutron Star (BNS) systems. In our research, we use the numerical code SGRD to produce initial data for BNS with a significant amount of spin. Additionally, we utilize the Sly equation of state and focus on equal-mass binaries. The initial data are later evaluated using two different numerical tools: the Einstein Toolkit Cactus (ETC) and BAM.

Our primary goal is to simulate the system, assess the influence of spin, and provide outcomes for the theoretical predictions of gravitational and electromagnetic wave emission in BNS merger events. Another aspect of this research is the comparison of the numerical tools, ETC and BAM, focusing on their efficiency, accuracy, and range of application.

In my talk, I will present and compare the recent results of BNS simulations performed by both ETC and BAM. I will showcase typical outputs, such as binary separation and psi4 extraction, and discuss their dependence on the spin value.