Dark Energy Survey Year 1 Clusters are Consistent with Planck

Understand

The recent Dark Energy Survey Year 1 (DES-Y1) analysis of galaxy cluster abundances and weak lensing produced $\Omega_{\rm m}$ and $\sigma_8$ constraints in 5.6$\sigma$ tension with Planck.

• It is suggested in that work that this tension is driven by unmodelled systematics in optical cluster selection.
• We present a novel simulation-based forward modeling framework that explicitly incorporates cluster selection into its model predictions.
• Applying this framework to the DES-Y1 data we find consistency with Planck, resolving the tension found in the DES-Y1 analysis.