DES Year 3 shear data get their first integrated three-point cosmology, and adding it to two-point statistics roughly doubles the figure of merit
Weak-lensing shear data from the third year of the Dark Energy Survey (DES Y3) have been analysed cosmologically with the integrated three-point correlation function (i3PCF), a higher-order statistic that correlates local aperture mass with surrounding shear, and for the first time a three-point shear statistic on survey data is treated with fully simulation-based inference. Jointly with the two-point correlation functions, the i3PCF is detected at a signal-to-noise ratio of 12.8, and the figure of merit in the Ωm–S8–w space roughly doubles over two-point statistics alone, with the gain coming from angular scales where baryonic effects are subdominant.