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Explore the evolution of weak gravitational lensing observations in this 16-minute conference talk that examines the critical transition from Stage III to Stage IV surveys. Learn about the fundamental principles of weak lensing as a cosmological probe and understand how gravitational effects from large-scale structure subtly distort the shapes of distant galaxies. Discover the current capabilities and limitations of Stage III surveys like the Dark Energy Survey and KiDS, then delve into the revolutionary advances expected from Stage IV experiments including Euclid, the Vera Rubin Observatory, and the Nancy Grace Roman Space Telescope. Examine the technical challenges involved in measuring these minute shape distortions with unprecedented precision, including systematic error control, calibration requirements, and data analysis methodologies. Understand how this transition will dramatically improve our ability to constrain dark energy, dark matter, and modified gravity theories through enhanced statistical power and reduced systematic uncertainties.
