Orateur
Description
The abundance of massive halos (and of the galaxy clusters they host) has long been recognized as an extremely promising probe of the large-scale structure of the universe. Over the past decade, tremendous progress was made, notably thanks to the availability of high-resolution surveys of the Cosmic Microwave Background (CMB), of high-quality measurements of gravitational lensing, and of advanced numerical simulations.
The sample of galaxy clusters selected by the South Pole Telescope (SPT, combining the SPT-SZ and SPTpol surveys) in the CMB now exceeds a thousand objects. The systematics in weak-lensing based mass calibration using Dark Energy Survey Year 3 (DES Y3) are less than 5%. The joint analysis of the cluster abundance and weak-lensing mass calibration can therefore provide tight cosmological constraints.
In my talk, I will review the SPT cluster cosmology and mass calibration program. I will focus on the SPT + DES Y3 analysis and present new constraints on the ΛCDM and wCDM models.
