Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing

• Published in: arXiv.org 2022-03
• Main Authors: Collaboration, DES, Abbott, T M C, Alarcon, A, Andrade-Oliveira, F, Bacon, D, Baxter, E, Bechtol, K, Becker, M R, Bernstein, G M, Bhargava, S, Birrer, S, Brooks, D, Buckley-Geer, E, Camacho, H, Campos, A, M Carrasco Kind, Carretero, J, Castander, F J, Chen, A, Chen, R, Conselice, C, Cordero, J, Costanzi, M, da Costa, L N, M E da Silva Pereira, Davis, C, De Vicente, J, DeRose, J, Desai, S, Diehl, H T, Dodelson, S, Doux, C, Drlica-Wagner, A, Eckert, K, Eifler, T F, Elsner, F, Elvin-Poole, J, Fosalba, P, Gatti, M, Gaztanaga, E, Gerdes, D W, Gruen, D, Gruendl, R A, Gutierrez, G, Honscheid, K, Huff, E M, Jain, B, Jeltema, T, Kovacs, A, Krause, E, Kron, R, Kuropatkin, N, Lahav, O, P -F Leget, Lemos, P, Lidman, C, MacCrann, N, Martini, P, Melchior, P, Menanteau, F, Myles, J, Nadathur, S, Nichol, R C, Ogando, R L C, Palmese, A, Pandey, S, Park, Y, Paz-Chinchón, F, Pieres, A, Plazas Malagón, A A, Porredon, A, Rodriguez-Monroy, M, Rollins, R P, Roodman, A, Ross, A J, Samuroff, S, Sánchez, C, Sanchez, E, Sanchez, J, Scarpine, V, Schubnell, M, Scolnic, D, Secco, L F, Serrano, S, Sevilla-Noarbe, I, Shin, T, Smith, M, Soares-Santos, M, Suchyta, E, Tarle, G, Troja, A, Tutusaus, I, Varga, T N, Walker, A R, Wechsler, R, Weller, J, Yanny, B, Yin, B, Zhang, Y, Zuntz, J
• Format: Article
• Language: English
• Subjects: Anisotropy; Astronomical models; Clustering; Confidence limits; Cosmic microwave background; Cosmology; Cross correlation; Dark energy; Galaxies; Large scale structure of the universe; Lenses; Parameters; Red shift; Sky surveys (astronomy); Statistical analysis; Supernovae
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2105.13549

We present the first cosmology results from large-scale structure in the Dark Energy Survey (DES) spanning 5000 deg\(^2\). We perform an analysis combining three two-point correlation functions (3\(\times\)2pt): (i) cosmic shear using 100 million source galaxies, (ii) galaxy clustering, and (iii) the cross-correlation of source galaxy shear with lens galaxy positions. The analysis was designed to mitigate confirmation or observer bias; we describe specific changes made to the lens galaxy sample following unblinding of the results. We model the data within the flat \(\Lambda\)CDM and \(w\)CDM cosmological models. We find consistent cosmological results between the three two-point correlation functions; their combination yields clustering amplitude \(S_8=0.776^{+0.017}_{-0.017}\) and matter density \(\Omega_{\mathrm{m}} = 0.339^{+0.032}_{-0.031}\) in \(\Lambda\)CDM, mean with 68% confidence limits; \(S_8=0.775^{+0.026}_{-0.024}\), \(\Omega_{\mathrm{m}} = 0.352^{+0.035}_{-0.041}\), and dark energy equation-of-state parameter \(w=-0.98^{+0.32}_{-0.20}\) in \(w\)CDM. This combination of DES data is consistent with the prediction of the model favored by the Planck 2018 cosmic microwave background (CMB) primary anisotropy data, which is quantified with a probability-to-exceed \(p=0.13\) to \(0.48\). When combining DES 3\(\times\)2pt data with available baryon acoustic oscillation, redshift-space distortion, and type Ia supernovae data, we find \(p=0.34\). Combining all of these data sets with Planck CMB lensing yields joint parameter constraints of \(S_8 = 0.812^{+0.008}_{-0.008}\), \(\Omega_{\mathrm{m}} = 0.306^{+0.004}_{-0.005}\), \(h=0.680^{+0.004}_{-0.003}\), and \(\sum m_{\nu}