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We perform an analysis of the three-dimensional cosmic matter density fieldtraced by galaxies of the SDSS-III/BOSS galaxy sample. The systematic-freenature of this analysis is confirmed by two elements: the successfulcross-correlation with the gravitational lensing observations derived fromPlanck 2018 data and the absence of bias at scales $k \simeq 10^{-3}-10^{-2}h$Mpc$^{-1}$ in the a posteriori power spectrum of recovered initial conditions.Our analysis builds upon our algorithm for Bayesian Origin Reconstruction fromGalaxies (BORG) and uses a physical model of cosmic structure formation toinfer physically meaningful cosmic structures and their corresponding dynamicsfrom deep galaxy observations. Our approach accounts for redshift-spacedistortions and light-cone effects inherent to deep observations. We also applydetailed corrections to account for known and unknown foregroundcontaminations, selection effects and galaxy biases. We obtain maps ofresidual, so far unexplained, systematic effects in the spectroscopic data ofSDSS-III/BOSS. Our results show that unbiased and physically plausible modelsof the cosmic large scale structure can be obtained from present andnext-generation galaxy surveys.

Systematic-free inference of the cosmic matter density field from SDSS3-BOSS data