Combined $13\times2$-point analysis of the Cosmic Microwave Background and Large-Scale Structure: implications for the $S_8$-tension and neutrino mass constraints

Understand

We present cosmological constraints for the flat $\Lambda$CDM model, including the sum of neutrino masses, by performing a multi-probe analysis of a total of 13 tomographic auto- and cross-angular power spectra.

• This is achieved by combining, at map level, the latest primary CMB and CMB-lensing measurements from the Planck 2018 data release, as well as spectroscopic galaxy samples from BOSS DR12, and the latest Kilo-Degree Survey (KiDS-1000) tomographic weak lensing shear data release.
• Our analysis includes auto- and cross-correlations as well as calibration parameters for all cosmological probes, thus providing a self-calibration of the combined data sets.
• We find a good fit (reduced $\chi^2$=1.7) for the combined probes with calibration parameters only moderately different from their nominal value, thus giving a possible interpretation of the tension between the early- and late-Universe probes.