Multiprobe cosmology from the abundance of SPT clusters and DES galaxy clustering and weak lensing
Journal Article
Overview
abstract
; Cosmic shear, galaxy clustering, and the abundance of massive halos each probe the large-scale structure of the Universe in complementary ways. We present cosmological constraints from the joint analysis of the three probes, building on the latest analyses of the lensing-informed abundance of clusters identified by the South Pole Telescope (SPT) and of the auto- and cross-correlation of galaxy position and weak lensing measurements (; ; 3; ×; 2; pt; ; ) in the Dark Energy Survey (DES). We consider the cosmological correlation between the different tracers and we account for the systematic uncertainties that are shared between the large-scale lensing correlation functions and the small-scale lensing-based cluster mass calibration. Marginalized over the remaining; ; Λ; ; cold dark matter (; ; Λ; CDM; ; ) parameters (including the sum of neutrino masses) and 52 astrophysical modeling parameters, we measure; ; ; Ω; m; ; =; 0.300; ±; 0.017; ; and; ; ; σ; 8; ; =; 0.797; ±; 0.026; ; . Compared to constraints from primary cosmic microwave background (CMB) anisotropies, our constraints are only 15% wider with a probability to exceed of 0.22 (; ; 1.2; σ; ; ) for the two-parameter difference. We further obtain; ; ; S; 8; ; ≡; ; σ; 8; ; (; ; Ω; m; ; /; 0.3; ; ); 0.5; ; =; 0.796; ±; 0.013; ; which is lower than the measurement at the; ; 1.6; σ; ; level. The combined SPT cluster, DES; ; 3; ×; 2; pt; ; , and datasets mildly prefer a nonzero positive neutrino mass, with a 95% upper limit; ; ∑; ; m; ν; ; <; 0.25; ; ; eV; ; on the sum of neutrino masses. Assuming a; ; w; CDM; ; model, we constrain the dark energy equation of state parameter; ; w; =; −; 1.1; ; 5; ; −; 0.17; ; ; +; 0.23; ; ; ; and when combining with primary CMB anisotropies, we recover; ; w; =; −; 1.2; ; 0; ; −; 0.09; ; ; +; 0.15; ; ; ; , a; ; 1.7; σ; ; difference with a cosmological constant. The precision of our results highlights the benefits of multiwavelength multiprobe cosmology and our analysis paves the way for upcoming joint analyses of next-generation datasets.;
