Dhayaa Anbajagane, C. Chang, A. Drlica-Wagner, Chin Yi Tan, M. Adamów, R. A. Gruendl, L. F. Secco, Z. Zhang, M. R. Becker, P. S. Ferguson, Nathalie Chicoine, Katherine Herron, A. Alarcon, Rayane Brinck Teixeira, D. J. Suson, A Navarro-Alsina, A. Amon, F. Andrade-Oliveira, J. Blazek, C. R. Bom, H. Camacho, J. A. Carballo-Bello, A. Carnero Rosell, R. Cawthon, W. Cerny, A. Choi, Young‐Jun Choi, S Dodelson, C. Doux, K. Eckert, J. Elvin-Poole, J. Esteves, M. Gatti, G. Giannini, W. G. Hartley, D. Gruen, K. Herner, Eric Huff, D. J. James, Mike Jarvis, E. Krause, N. Kuropatkin, C. E. Martínez-Vázquez, Pol Massana, S. Mau, J. McCullough, G. E. Medina, Burçı̇n Mutlu-Pakdı̇l, J. Myles, M. Navabi, Noelia E. D. Noël, Andrew B. Pace, A. Porredon, J. Prat, Marco Raveri, A. H. Riley, E. S. Rykoff, J. D. Sakowska, S. Samuroff, D. Sanchez-Cid, D. J. Sand, L. Santana-Silva, I. Sevilla-Noarbe, T. Shin, M. Soares-Santos, Guy S. Stringfellow, C. To, Amy S. K. Tong, M. A. Troxel, A. K. Vivas, M. Yamamoto, B Yanny, B. Yin, Y. Zhang, J. Zuntz
We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark Energy Camera (DECam) imaging of 5 , 412 deg 2 of sky that is outside the Dark Energy Survey (DES) footprint. We derive constraints on the cosmological parameters S 8 = 0.791 − 0.032 + 0.027 and for the Λ CDM model, which are consistent with those from other weak lensing surveys and from the cosmic microwave background. We combine our results with cosmic shear results from DES Y3 at the likelihood level, since the two datasets span independent areas on the sky. The combined measurements, which cover ≈ 10 , 000 deg 2 , prefer S 8 = 0.791 ± 0.023 and under the Λ CDM model. These results are the culmination of a series of rigorous studies that characterize and validate the DECADE dataset and the associated analysis methodologies (Anbajagane et. al 2025a,b,c). Overall, the DECADE project demonstrates that the cosmic shear analysis methods employed in Stage-III weak lensing surveys can provide robust cosmological constraints for fairly inhomogeneous datasets. This opens the possibility of using data that have been previously categorized as ``unusable’’ for cosmic shear analyses, thereby increasing the statistical power of upcoming weak lensing surveys.