U2-2016
Exploring gravity and the dark sector using galaxy clusters
Galaxy clusters are excellent natural laboratories to study the nature of gravity and test alternatives to the Concordance Model, at the edge between cosmology and astrophysics. Their mass profiles, obtained with complementary probes (kinematics of galaxies, X-ray emission of the hot gas and gravitational lensing) are sensitive in different ways to the dark sector and to the gravitational interaction. I will show how mass profiles of clusters can be used to constrain deviation from General Relativity, further present recent results obtained on a sample of clusters from the CLASH-VLT and CHEX-MATE collaborations, using the updated version of MG-MAMPOSSt, a code that reconstructs the mass distribution of clusters with kinematics and lensing analyses in modified gravity/Dark Energy frameworks. I will discuss alternatives to $\Lambda$CDM scenario and possible bounds in the parameter space that can be derived using this combination of kinematics and lensing analyses.