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Explore cutting-edge research on peculiar velocities in cosmology through this informal astronomy talk by Yan-Chuan Cai from the Institute for Astronomy at the University of Edinburgh. Discover how peculiar velocities on large scales contain valuable cosmological information, with particular focus on the challenges of measuring transverse velocities compared to the more routinely observed line-of-sight velocities through redshift-space distortions and the kinetic Sunyaev-Zel'dovich (kSZ) effect. Learn about a groundbreaking detection of gravitational dipoles aligned with transverse velocities, identified through their signatures on the Cosmic Microwave Background. Examine the limitations of conventional analytical approaches to redshift-space distortions and the kSZ effect, and understand how density-split statistics can enhance data analysis to improve cosmological modeling and constraints. Gain insights into advanced observational techniques and theoretical frameworks that are pushing the boundaries of our understanding of cosmic structure formation and evolution.
