Orateur
Description
Stage-III galaxy surveys have shown that weak lensing, and combined 3x2pt analyses, can provide exquisite constraints on the dark components of the Universe. Following a successful launch in July 2023 and the start of its scientific survey in February 2024, Euclid has become the first stage-IV photometric survey in operations. This marks the start of even more exciting science from weak lensing analyses using stage-IV data. In this talk I will present the forecasts for weak lensing and combined analyses at the end of stage-IV missions, focusing in particular on how combining multiple probes helps break parameter degeneracies and leads to tighter constraints on the cosmological model under investigation. I will conclude by outlining the current efforts toward a combined analysis with Euclid's first data release.