Dark energy survey: Modeling strategy for multiprobe cluster cosmology and validation for the full six-year dataset

Le résumé fourni par la source

We introduce an updated To model for joint analyses of cluster abundances and large-scale two-point correlations of weak lensing and galaxy and cluster clustering (termed $\mathrm{CL}+3\ifmmode\times\else\texttimes\fi{}2\text{ }\text{ }\mathrm{pt}$ analysis) and validate that this model meets the systematic accuracy requirements of analyses with the statistical precision of the final Dark Energy Survey (DES) Year 6 (Y6) dataset. The validation program consists of two distinct approaches, (i) identification of modeling and parametrization choices and impact studies using simulated analyses with each possible model misspecification and (ii) end-to-end validation using mock catalogs from customized Cardinal simulations that incorporate realistic galaxy populations and DES-Y6-specific galaxy and cluster selection and photometric redshift modeling, which are the key observational systematics. In combination, these validation tests indicate that the model presented here meets the accuracy requirements of DES-Y6 for $\mathrm{CL}+3\ifmmode\times\else\texttimes\fi{}2\text{ }\text{ }\mathrm{pt}$ based on a large list of tests for known systematics. In addition, we also validate that the model is sufficient for several other data combinations: the $\mathrm{CL}+\mathrm{GC}$ subset of this data vector (excluding galaxy--galaxy lensing and cosmic shear two-point statistics) and the $\mathrm{CL}+3\ifmmode\times\else\texttimes\fi{}2\text{ }\text{ }\mathrm{pt}+\mathrm{BAO}+\mathrm{SN}$ (combination of $\mathrm{CL}+3\ifmmode\times\else\texttimes\fi{}2\text{ }\text{ }\mathrm{pt}$ with the previously published Y6 DES baryonic acoustic oscillation and Y5 supernovae data).

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.