Cluster Clustering Cosmology: new constraints on the cosmic growth rate from redshift-space clustering anisotropies
Federico Marulli (Unibo)
Tuesday 25/10/2022 @ 14:00, Sala IV piano Battiferro - Presenza + remoto
Redshift-space distortions in the clustering of galaxy clusters provide a novel probe to test the theory of gravity on cosmological scales. I will present the new constraints on the linear growth rate of cosmic structures we derived from the redshift-space two-point correlation function of galaxy clusters in the Sloan Digital Sky Survey. We constructed a large spectroscopic catalog of optically selected clusters comprising 43743 clusters, with masses estimated from X-ray and weak-lensing calibrated scaling relations. The cluster masses are used to set a prior on the linear bias of the sample. This represents the main advantage in using galaxy clusters as cosmic probes, instead of galaxies. Assuming a standard cosmological model consistent with the latest cosmic microwave background constraints, we do not find any evidence of deviations from General Relativity.