I. INTRODUCTION  
II. DATA AND BASELINE MODELING  
A. Source and lens catalogues  
B. 2PCF – measurements  
C. 2PCF – baseline modeling  
D. Scale cuts  
E. Parameter space  
III. BEYOND-ΛCDM MODELS  
A. Dark energy: \(\mathbf{\nabla}w_{0}-\mathbf{\nabla}w_{a}\)  
B. Curvature: \(\Omega_{k}\)  
C. Extra relativistic degrees of freedom: \(N_{\mathrm{eff}}\)  
D. Massive sterile neutrinos: \(N_{\mathrm{eff}}-m_{\mathrm{eff}}\)  
E. Test of gravity on cosmological scales: \(\pmb{\Sigma_{0}}-\pmb{\mu_{0}}\)  
F. Binned \(\sigma_{8}(z)\)  
IV. EXTERNAL DATA  
A. Cosmic microwave background  
B. Baryon acoustic oscillations and redshift space distortions  
C. Supernovae  
V. ANALYSIS PROCEDURE AND VALIDATION  
A. Fiducial synthetic data  
B. ‘Contaminated’ synthetic data  
C. Robustness to model variations  
VI. RESULTS  
A. Results: \(\mathbf{\nabla}w_{0}\mathrm{~-~}\mathbf{\nabla}w_{a}\)  
B. Results: \(\Omega_{k}\)  
C. Results: \(N_{\mathbf{eff}}\)  
D. Results: \(N_{\mathrm{eff}}-m_{\mathrm{eff}}\)  
E. Results: \(\pmb{\Sigma_{0}}-\pmb{\mu_{0}}\)  
F. Results: binned \(\sigma_{8}(z)\)  
G. Impact of model and analysis choices on \(S_{8}\)  
H. Impact of model choice on \(\sum m_{\nu}\)  
I. Tension between DES and external data for extended models  
J. Assessing the preference for extended models relative to ΛCDM  
VII. CONCLUSIONS