Abbott, TMC;
Aguena, M;
Alarcon, A;
Amon, A;
Anbajagane, D;
Andrade-Oliveira, F;
Avila, S;
... Zhou, C; + view all
(2025)
Dark energy survey year 3 results: Cosmological constraints from cluster abundances, weak lensing, and galaxy clustering.
Physical Review D
, 112
(8)
, Article 083535. 10.1103/3dzh-d8f5.
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Abstract
Galaxy clusters provide a unique probe of the late-time cosmic structure and serve as a powerful independent test of the ΛCDM model. This work presents the first set of cosmological constraints derived with ∼16; 000 optically selected redMaPPer clusters across nearly 5000 deg2 using DES year 3 datasets. Our analysis leverages a consistent modeling framework for galaxy cluster cosmology and DES-Y3 joint analyses of galaxy clustering and weak lensing (3 × 2pt), ensuring direct comparability with the DES-Y3 3 × 2pt analysis. We obtain constraints of S8 ¼ 0.864 0.035 and Ωm ¼ 0.265þ0.019 −0.031 from the cluster-based data vector. We find that cluster constraints and 3 × 2pt constraints are consistent under the ΛCDM model with a posterior predictive distribution (PPD) value of 0.53. The consistency between clusters and 3 × 2pt provides a stringent test of ΛCDM across different mass and spatial scales. Jointly analyzing clusters with 3 × 2pt further improves cosmological constraints, yielding S8 ¼ 0.811þ0.022 −0.020 and Ωm ¼ 0.294þ0.022 −0.033 , a 24% improvement in the Ωm − S8 figure of merit over 3 × 2pt alone. Moreover, we find no significant deviation from the Planck CMB constraints with a probability to exceed (PTE) value of 0.6, significantly reducing previous S8 tension claims. Finally, combining DES 3 × 2pt, DES clusters, and Planck CMB places an upper limit on the sum of neutrino masses of Pmν < 0.26 eV at 95% confidence under the ΛCDM model. These results establish optically selected clusters as a key cosmological probe and pave the way for cluster-based analyses in upcoming stage-IV surveys such as LSST, Euclid, and Roman.
| Type: | Article |
|---|---|
| Title: | Dark energy survey year 3 results: Cosmological constraints from cluster abundances, weak lensing, and galaxy clustering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/3dzh-d8f5 |
| Publisher version: | https://doi.org/10.1103/3dzh-d8f5 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10217330 |
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