Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering

The authors use Dark Energy Survey data on galaxy clustering and lensing from the first three years of observations combined with five prominent external datasets. They robustly constrain six potential extensions to the currently prevalent cosmological paradigm of {Λ}CDM (Cold Dark Matter with a cosmological constant). All extensions would add significant new physics, such as deviations from General Relativity or non-zero spatial curvature, but no significant evidence for new physics is found.