HSC Year 1 cosmology results with the minimal bias method: HSC × BOSS galaxy-galaxy weak lensing and BOSS galaxy clustering

We present cosmological parameter constraints from a blinded joint analysis of galaxy-galaxy weak lensing, Δ Σ ( R ) , and the projected correlation function, w p ( R ) , measured from the first-year HSC (HSC-Y1) data and SDSS spectroscopic galaxies over 0.1512 and 8h-1 Mpc for Δ Σ ( R ) and w p ( R ) , respectively, where the perturbation-theory-inspired model is valid. As part of our model, we account for the effect of lensing magnification bias on the Δ Σ measurements. When we employ weak priors on cosmological parameters, without cosmic microwave background (CMB) information, we find S8=0.936-0.086+0.092 , σ8=0.85-0.11+0.16 , and Ω m =0.283-0.035+0.12 (mode and 68% credible interval) for the flat Λ CDM model. Although the central value of S8 appears to be larger than those inferred from other cosmological experiments, we find that the difference is consistent with expected differences due to sample variance, and our results are consistent with the other results to within the statistical uncertainties. When combined with the Planck 2018 likelihood for the primary CMB anisotropy information ( TT,TE,EE+lowE ), we find S8=0.817-0.021+0.022 , σ8=0.892-0.056+0.051 , Ω m =0.246-0.035+0.045 , and the equation-of-state parameter of dark energy, wde=-1.28-0.19+0.20 for the flat wCDM model, which is consistent with the flat Λ CDM model to within the error bars.