Symmetry constraints on defects and scattering amplitudes
2 PM, 16 Oct 2025
Christian Copetti from Oxford University shows how generalised symmetries guide quantum systems, shaping boundary conditions and defects.
Symmetry is a powerful organising principle, enabling remarkably precise, all-order predictions about the behaviour of quantum systems. Dr Christian Copetti explains how generalised symmetries act on boundary conditions and defects, and uses these ideas to constrain key features of (1+1)d scattering amplitudes, such as crossing symmetry, and shows how ultraviolet defects may be screened by bulk degrees of freedom.
Dr Christian Copetti is a postdoc at Oxford University. He did his PhD at IFT in Madrid and then held a research position at SISSA in Trieste. His recent work spans generalized symmetries, defect dynamics, S-matrix bootstrap, and topological constraints in quantum field theories.















