Kavli Affiliate: Eli Rykoff
| Summary:
We present a simulation-based forward-modeling framework for cosmological inference from optical galaxy-cluster samples, and apply it to the abundance and weak-lensing signals of DES-Y1 redMaPPer clusters. The model embeds cosmology-dependent optical selection using a counts-in-cylinders approach, while also accounting for cluster miscentering and baryonic feedback in lensing. Applied to DES-Y1, and assuming a flat $Λ$CDM cosmology, we obtain $Ω_m=0.254^+0.026_-0.020$ and $σ_8=0.826^+0.030_-0.034$, consistent with a broad suite of low-redshift structure measurements, including recent full-shape analyses, the DES/KiDS/HSC 3$times$2 results, and most cluster-abundance studies. Our results are also consistent with textitPlanck, with the difference being significant at $2.58σ$. These results establish simulation-based forward-modeling of cluster abundances as a promising new tool for precision cosmology with Stage~IV survey data.
| Search Query: arXiv Query: search_query=au:”Rykoff Eli”&id_list=&start=0&max_results=10
Read More