Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future

Abstract We show the improvement to cosmological constraints from galaxy cluster surveys with addition of cosmic microwave background (CMB)-cluster lensing data. explore implications adding mass information 3.1 ? detection gravitational CMB by clusters Sunyaev–Zel’dovich (SZ) selected sample 2500 deg 2 SPT-SZ survey and targeted optical X-ray follow-up In ?CDM model, combination Planck power spectrum measurements prefers ? 8 ? m / 0.3 0.5 = 0.831 ± 0.020 . Adding data reduces uncertainty on this quantity a factor 1.4, which is unchanged whether CMB-cluster measurement included or not. then forecast impact future catalogs. SZ catalog ongoing SPT-3G expected improve constraint dark energy equation state w 1.3 ( ) = 0.19. find largest improvements be for 8 , where number counts respective factors 2.4 3.6 CMB-S4.