MG-MAMPOSSt, a Fortran code to test gravity at galaxy-cluster scales

MG-MAMPOSST is a FORTRAN90 code to perform tests of General Relativity (GR) through the analysis of kinematic observations of galaxy clusters. The code solves the Jeans equation, building on the MAMPOSST method of Mamon et al. (2013). It extends this method through new parametrisations of the gravitational potential for general families of gravity theories beyond GR aimed to explain the late-time accelerated expansion of the universe Perlmutter et al. (1999). Through appropriate input of the projected positions and line-of-sight velocities of a cluster’s member galaxies, MG-MAMPOSST reconstructs the cluster mass profile and the velocity anisotropy profile in modified gravity, jointly constraining the kinematics (mass and anisotropy profile) and modified gravity parameters. The code is further supplemented with a new capability to produce weak lensing forecasts for joint kinematic and lensing analysis, offering a valuable tool for studying the nature of gravity at cluster scales.