Dark Energy survey year 6 results. Weak lensing and galaxy clustering cosmological analysis framework
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2026
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01A - Journal article
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Physical Review D
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114
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6
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American Physical Society
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Abstract
We present the methodology for the weak lensing and galaxy clustering analyses of the Dark Energy Survey (DES) Year 6 dataset. In this work, we design and validate the analysis pipeline for the cosmic shear, galaxy clustering plus galaxy–galaxy lensing (2 ×2pt), and the joint analysis in the 3 ×2pt. Our framework accounts for key theoretical uncertainties, such as baryonic feedback and galaxy bias, incorporating both linear and nonlinear models. We apply scale cuts in regimes where theoretical modeling becomes unreliable. The robustness of the pipeline is validated using mock data and simulations, confirming unbiased cosmological constraints and highlighting the importance of posterior projection effects in the validation process. As a result, we deliver robust and validated analysis pipelines for cosmic shear, 2 ×2pt, and 3 ×2pt in ΛCDM and 𝑤CDM scenarios, including a well-defined set of scales suitable for real data analysis, a robust prescription for theoretical systematics, and the theoretical covariance of the signal. This comprehensive methodology also lays the groundwork for future galaxy surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time.
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2470-0029
2470-0010
2470-0010
Language
English
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Yes
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Published
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peer-reviewed
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Closed
Citation
Sanchez-Cid, D., Ferté, A., Blazek, J., Samuroff, S., Amon, A., Andrade-Oliveira, F., Coloma-Nadal, J. M., Muir, J., Porredon, A., Prat, J., Weaverdyck, N., Yamamoto, M., Anbajagane, D., Becker, M. R., Carrilho, P., Chang, C., Crocce, M., Giannini, G., d’Assignies, W., et al. (2026). Dark Energy survey year 6 results. Weak lensing and galaxy clustering cosmological analysis framework. Physical Review D, 114(6). https://doi.org/10.1103/8n76-f6ln