Séminaire doctorant : Constantin Payerne : Galaxy cluster cosmology in the Rubin/LSST era

The calibration of the mass-richness relation is a key ingredient for cosmology with galaxy cluster abundance. In the context of optical surveys such as the Rubin LSST, weak gravitational lensing can be used as a powerful tool to estimate cluster masses. We use the cluster-galaxy weak lensing in the simulated galaxy catalogs of the Data Challenge 2 (DC2) of the Dark Energy Science Collaboration to estimate galaxy cluster masses. We focus on the impact of possible sources of systematics that affects the mass estimation up to the constraint of the mass-richness relation.