Cosmological Constraints from Six Years of Dark Energy Survey Data

Invited-In-person  · Invited

Abstract

In this talk, I will present constraints on cosmology from the analysis of six years of Dark Energy Survey data. I will describe the recently completed large-scale structure plus weak gravitational lensing analysis, present its cosmological constraints, and present its combination with both other Dark Energy Survey analyses and external analyses.

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Publication: Gold Catalogs: K. Bechtol et al., Dark Energy Survey Year 6 Results: Photometric Data Set for Cosmology (arXiv:2501.05739, 2005)

Balrog/SSI: D. Anbajagane, M. Tabbutt, et al., Dark Energy Survey Year 6 Results: Synthetic-source Injection Across the Full Survey Using Balrog, OJA, 8, 65 (arXiv:2501.05683, 2025)

PSF: T. Schutt et al., Dark Energy Survey Year 6 Results: Point-Spread Function Modeling, OJA, 8, 26 (arXiv:2501.05781, 2025)

Masking: M. Rodríguez-Monroy, N. Weaverdyck, et al., Dark Energy
Survey Year 6 Results: improved mitigation of spatially varying observational systematics with masking (arXiv:2509.07943, 2025)

Source Sample: M. Yamamoto, M. R. Becker, et al., Dark Energy Survey
Year 6 Results: Cell-based Coadds and Metadetection Weak Lensing Shape Catalogue, MNRAS, 543, 4156 (arXiv:2501.05665, 2025)

Lens Sample: N. Weaverdyck, M. Rodríguez-Monroy, et al., Dark Energy Survey Year 6 Results: MagLim++ Lens Sample Definition and Measurements of Galaxy Clustering (arXiv:2601.14484, 2026)

Source PZ: B. Yin et al., Dark Energy Survey Year 6 Results: Redshift Calibration of the Weak Lensing Source Galaxies (arXiv:2510.23566, 2025)

Magnification: E. Legnani et al., Dark Energy Survey Year 6 Results:
Magnification modeling and its impact on galaxy clustering and galaxy-galaxy lensing cosmology (arXiv:2601.14833, 2026)

Clustering PZ: W. d'Assignies et al., Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps n(z) realizations for 3x2pt samples (arXiv:2510.23565, 2025)

Sampling Methods: G. Bernstein et al., Sampling posterior distributions when only samples from a prior are available (arXiv:2506.00758, 2025)

Image Sims: S. Mau, M. Becker, et al., Dark Energy Survey Year 6 Results: Image Simulations for Weak Lensing Shear and Photometric Redshift Calibration, in prep (2026)

Mock Catalogs: C.-H. To et al., Dark Energy Survey: Modeling strategy for multiprobe cluster cosmology and validation for the full six-year dataset, PRD, 112, 063537 (arXiv:2503.13631, 2025)

Modeling and Analysis: D. Sanchez-Cid, A. Ferté, et al., Dark Energy Survey
Year 6 Results: Multi-Probe Modeling Strategy and Validation (arXiv:2601.14859, 2026)

Lens PZ: G. Giannini et al., Dark Energy Survey Year 6 Results: Redshift Calibration of the MagLim++ Lens Sample (arXiv:2509.07964, 2025)

Posterior Checks: C. Doux, J. Muir, et al., Dark Energy Survey Year 6 Results: fast and interpretable posterior predictive checks for correlated cosmic probes, in prep (2026)

GGL: G. Giannini et al., Dark Energy Survey Year 6 Results: Galaxy-galaxy Lensing (arXiv:2601.15175, 2026)

3x2 Cosmology: DES Collaboration, Dark Energy Survey Year 6 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing (arXiv:2601.14559, 2026)

Presenters

  • Matthew Becker

    • Argonne National Laboratory

Authors

  • Matthew Becker

    • Argonne National Laboratory