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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.25706 |
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| _version_ | 1866914122081239040 |
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| author | Salcedo, Andrés N. Rozo, Eduardo Wu, Hao-Yi Weinberg, David H. Chiploonkar, Pranav To, Chun-Hao Cao, Shulei Rykoff, Eli S. Gountanis, Nicole Marcelina Zhou, Conghao |
| author_facet | Salcedo, Andrés N. Rozo, Eduardo Wu, Hao-Yi Weinberg, David H. Chiploonkar, Pranav To, Chun-Hao Cao, Shulei Rykoff, Eli S. Gountanis, Nicole Marcelina Zhou, Conghao |
| contents | 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 \textit{Planck}, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_25706 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological Constraints from Dark Energy Survey Year 1 Cluster Lensing and Abundances with Simulation-based Forward-Modeling Salcedo, Andrés N. Rozo, Eduardo Wu, Hao-Yi Weinberg, David H. Chiploonkar, Pranav To, Chun-Hao Cao, Shulei Rykoff, Eli S. Gountanis, Nicole Marcelina Zhou, Conghao Cosmology and Nongalactic Astrophysics 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 \textit{Planck}, 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. |
| title | Cosmological Constraints from Dark Energy Survey Year 1 Cluster Lensing and Abundances with Simulation-based Forward-Modeling |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.25706 |