Open-source initial data for binary black holes and neutron stars*

I present the open-source module to generate initial data for binary black holes and neutron stars with the SpECTRE code. The code is publicly accessible, which means that initial data can be generated and then interpolated and imported into any evolution code. The initial data represents the state of the art of the SXS collaboration, specifically the superposed Kerr-Schild (SKS) or superposed harmonic Kerr (SHK) formalism. It supports high spins in arbitrary directions, excisions with negative-expansion boundary conditions to avoid extrapolation, and eccentricity control. The initial data can be generated in a containerized environment on a cluster or workstation and interpolated to the evolution grid in Python or C/Fortran. I demonstrate importing the initial data into the Einstein Toolkit and present the available tools and tutorials.