Speaker
Description
With the last decade of imaging surveys, such as the Dark Energy Survey (DES), a joint weak lensing and clustering analysis has been established as a powerful test of the cosmological model and probe of dark energy. In this talk, I will present weak lensing cosmology results measured with the Y6 shear catalog containing more than 150 million galaxies, constituting the most powerful weak lensing dataset to date. Extracting unbiased cosmological information requires a robust pixel-to-cosmology understanding, including in the measurements of galaxy shapes and fluxes from images and the modeling of astrophysical effects. While the quantity and quality of data promised by next-generation observatories, such as Roman and Rubin, will significantly improve, we must understand what systematic biases prevent us from unlocking their full cosmological information. I will highlight the technological advancements that DES Y6 has made across our analysis, and discuss the current limitations. Drawing on lessons learned, I will present a roadmap to maximize the scientific return from the Stage-IV weak lensing experiments, and with the combination of multi-probe observations such as CMB.
