MG-MAMPOSSt, a code to test gravity at galaxy-cluster scales: a technical introduction

TL;DR

MG-MAMPOSSt is a free Fortran95 code that tests gravity theories at galaxy-cluster scales using kinematic and lensing data, extending previous methods to include modified gravity models and forecasts.

Contribution

The paper introduces MG-MAMPOSSt, a new version of the code that incorporates parametrisations for alternative gravity theories and weak lensing forecasts, expanding its applicability.

Findings

Code successfully tests modified gravity models against galaxy cluster data.

Extended capabilities enable joint kinematic and lensing analysis.

Provides a framework for future modifications to include more gravity models.

Abstract

The \textsc{MG-MAMPOSSt} code is a license-free \textsc{Fortran95} code to perform tests of General Relativity (GR) through the analyses of kinematical data of galaxy clusters based on the Jeans' equation. The code is based on the \textsc{MAMPOSSt} method, and extends the original code through new parametrisations of the gravitational potential for general families of gravity theories beyond GR aimed to explain dark energy. \textsc{MG-MAMPOSSt} is further supplemented with a new capability to produce weak lensing forecasts for joint kinematic+lensing analysis. This document provides a technical description of the code's new features, functionality with respect to the original version, and instructions on its installation and use. Finally, we explain how the code could be further modified to include a wider family of gravity models and/or density profiles, that could allow its application in broader theoretical frameworks as well as other physical systems such as stellar clusters. A detailed forecast analysis for the modified gravity models currently implemented in the code can be found in the paper of Pizzuti et al., 2021.