Dark Energy survey year 6 results. Weak lensing and galaxy clustering cosmological analysis framework

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 ×2⁢pt), and the joint analysis in the 3 ×2⁢pt. 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 ×2⁢pt, and 3 ×2⁢pt in Λ⁢CDM and 𝑤⁢CDM 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.

Schlagwörter

Fachgebiet (DDC)

520 - Astronomie, Kartografie

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

2470-0029
2470-0010

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Ja

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

peer-reviewed

Open Access-Status

Closed

Lizenz

Zitation

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

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