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Explore how interacting conformal line defects can exist in free quantum field theories when inversion symmetry is broken in this physics seminar. Learn about the crucial role of a special cross ratio for bulk-defect-defect three point functions that remains invariant under the conformal group while changing sign under inversion. Examine the detailed case study of a free scalar field and discover a toy model example where this bulk field interacts through a Yukawa term with fermions on the line. Investigate the potential for nontrivial line defects in free Maxwell theory in four dimensions and free bulk fermions. Gain insights from recent research findings presented by Dongsheng Ge from Kyoto University, based on collaborative work with Chris Herzog and Sam Bartlett-Tisdall, offering new perspectives on the intersection of conformal field theory and quantum field theory.
