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Explore the kinetic Sunyaev-Zel'dovich (kSZ) velocity reconstruction technique applied to DESI galaxies using ACT DR6 data in this 20-minute conference talk. Learn about the methodology for extracting velocity information from the cosmic microwave background through cross-correlation with large-scale structure tracers. Discover how the Atacama Cosmology Telescope's sixth data release enables precise measurements of galaxy peculiar velocities through the kSZ effect. Examine the technical challenges and solutions involved in combining DESI galaxy survey data with CMB observations to reconstruct three-dimensional velocity fields. Understand the cosmological implications of these measurements for testing theories of structure formation and constraining dark matter models. Gain insights into the statistical methods used to extract weak kSZ signals from noisy data and the systematic effects that must be carefully controlled. Review the current results and their significance for multi-probe cosmology, including how velocity reconstruction complements traditional galaxy clustering and weak lensing analyses.
