Abstract The new version of the Motion4D-library now also includes the integration of a Sachs basis and the Jacobi equation to determine gravitational lensing of pointlike sources for arbitrary spac
Abstract In 2018 it was announced that the star S2, which had been monitored since 1992, orbiting the massive black hole Sgr A * in the center of the Milky Way galaxy, obeyed as programmed by Einstein
General Relativity puts forward the definitions of Causal Structures that are much needed to understand the entire structure of Space-time. These definitions arise due to the Pseudo-Riemannian nature
