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A 44-minute conference talk exploring topological lines supported on gapless boundaries of 3d TQFTs, presented by Brandon Rayhaun from Stony Brook University at the Generalized Symmetries: High-Energy, Condensed Matter and Mathematics KITP conference held April 7-10, 2025 at the Kavli Institute for Theoretical Physics (KITP) at UC Santa Barbara. Dive into the cutting-edge research connecting topological defects to symmetry actions in quantum field theory, a field that has seen tremendous progress over the past decade. Learn how these generalized symmetry concepts have revealed unexpected physical effects across condensed matter, high energy physics, and quantum gravity. This talk is part of a conference bringing together leading experts to share recent advances and open problems in the field, coordinated by Maissam Barkeshli, Michele Del Zotto, Sakura Schafer-Nameki, and Shu-Heng Shao.
