Cluster Cross-Correlation Cosmology

Ying Zu


Clusters are powerful probes of cosmic growth, which is the key to solving the mystery of cosmic acceleration. I will discuss two methods that investigate the distribution and motion of correlated matter and galaxies around clusters, one through cluster--shear correlation, the other through cluster--galaxy correlation in redshift space. I will present simple phenomenological models to explain the correlation signals observed in the Sloan Digital Sky Survey. Finally, I will discuss the prospect of combining the two methods, each of which probes a different part of the cluster potential, for revealing deviations from General Relativity on cosmological scales.