Validation of the DESI-DR1 3x2-pt analysis: scale cut and shear ratio tests
Abstract
Combined survey analyses of galaxy clustering and weak gravitational lensing (3x2-pt studies) will allow new and accurate tests of the standard cosmological model. However, careful validation is necessary to ensure that these cosmological constraints are not biased by uncertainties associated with the modelling of astrophysical or systematic effects. In this study we validate the combined 3x2-pt analysis of the Dark Energy Spectroscopic Instrument Data Release 1 (DESI-DR1) spectroscopic galaxy clustering and overlapping weak lensing datasets from the Kilo-Degree Survey (KiDS), the Dark Energy Survey (DES), and the Hyper-Suprime-Cam Survey (HSC). By propagating the modelling uncertainties associated with the non-linear matter power spectrum, non-linear galaxy bias and baryon feedback, we design scale cuts to ensure that measurements of the matter density and the amplitude of the matter power spectrum are biased by less than 30% of the statistical error. We also test the internal consistency of the data and weak lensing systematics by performing new measurements of the lensing shear ratio. We demonstrate that the DESI-DR1 shear ratios can be successfully fit by the same model used to describe cosmic shear correlations, and analyse the additional information that can be extracted about the source redshift distributions and intrinsic alignment parameters. This study serves as crucial preparation for the upcoming cosmological parameter analysis of these datasets.
Keywords
Cite
@article{arxiv.2510.05539,
title = {Validation of the DESI-DR1 3x2-pt analysis: scale cut and shear ratio tests},
author = {N. Emas and A. Porredon and C. Blake and J. DeRose and J. Aguilar and S. Ahlen and D. Bianchi and D. Brooks and F. J. Castander and T. Claybaugh and A. Cuceu and A. de la Macorra and A. Dey and B. Dey and P. Doel and S. Ferraro and J. E. Forero-Romero and C. Garcia-Quintero and E. Gaztañaga and S. Gontcho A Gontcho and G. Gutierrez and S. Heydenreich and K. Honscheid and D. Huterer and M. Ishak and S. Joudaki and R. Joyce and E. Jullo and S. Juneau and R. Kehoe and D. Kirkby and T. Kisner and A. Kremin and A. Krolewski and O. Lahav and M. Landriau and J. U. Lange and L. Le Guillou and A. Leauthaud and M. Manera and R. Miquel and S. Nadathur and W. J. Percival and F. Prada and G. Rossi and R. Ruggeri and E. Sanchez and C. Saulder and A. Semenaite and H. Seo and J. Silber and D. Sprayberry and Z. Sun and G. Tarlé and B. A. Weaver and R. H. Wechsler and R. Zhou},
journal= {arXiv preprint arXiv:2510.05539},
year = {2026}
}
Comments
21 pages, 11 figures, Published in the Open Journal of Astrophysics