The cosmological analysis of DES 3$times$2pt data from the Effective Field Theory of Large-Scale Structure
Guido D’Amico, Alexandre Refregier, Leonardo Senatore, Pierre Zhang
arXiv:2510.24878v1 Announce Type: new
Abstract: We analyze the Dark Energy Survey (DES) Year 3 data using predictions from the Effective Field Theory of Large-Scale Structure (EFTofLSS). Specifically, we fit three two-point observables (3$times$2pt), galaxy clustering, galaxy-galaxy lensing, and cosmic shear, using the one-loop expressions for the projected angular correlation functions. We validate our pipeline against numerical simulations and we check for several internal consistencies before applying it to the observational data. Fixing the spectral tilt and the baryons abundance, we measure $S_8=0.833pm 0.032$, $Omega_m = 0.272pm 0.022$, and $h = 0.773pm 0.049$, to about $3.8%$, $8.1%$, and $6.3%$, at $68%$CL, respectively. While our results are consistent within $lesssim 2sigma$ with those from Planck and the BOSS full-shape analyses, they exhibit stronger tension with those from DES collaboration 3$times$2pt analysis combined with a Big-Bang Nucleosynthesis prior, highlighting the impact of modeling, scale cuts, and choice of prior. The theory code and likelihood used for our analyses, texttt{PyFowl}, is made publicly available.arXiv:2510.24878v1 Announce Type: new
Abstract: We analyze the Dark Energy Survey (DES) Year 3 data using predictions from the Effective Field Theory of Large-Scale Structure (EFTofLSS). Specifically, we fit three two-point observables (3$times$2pt), galaxy clustering, galaxy-galaxy lensing, and cosmic shear, using the one-loop expressions for the projected angular correlation functions. We validate our pipeline against numerical simulations and we check for several internal consistencies before applying it to the observational data. Fixing the spectral tilt and the baryons abundance, we measure $S_8=0.833pm 0.032$, $Omega_m = 0.272pm 0.022$, and $h = 0.773pm 0.049$, to about $3.8%$, $8.1%$, and $6.3%$, at $68%$CL, respectively. While our results are consistent within $lesssim 2sigma$ with those from Planck and the BOSS full-shape analyses, they exhibit stronger tension with those from DES collaboration 3$times$2pt analysis combined with a Big-Bang Nucleosynthesis prior, highlighting the impact of modeling, scale cuts, and choice of prior. The theory code and likelihood used for our analyses, texttt{PyFowl}, is made publicly available.