New Structures and Formulations for S-matrices

 Prof. HE Song
 Institute of Theoretical Physics, Chinese Academy of Sciences


29 Nov 2018 (Thursday)
2:00 pm
IAS4042, 4/F, Lo Ka Chung Building, Lee Shau Kee Campus, HKUST

In the past decades and especially the last one, powerful new tools and remarkable new structures for perturbative scattering amplitudes in Quantum Field Theory (QFT) have been discovered. Apart from playing a prominent role in high-energy particle physics, these developments have important implications in a wide range: from string perturbation theory to multi-loop calculations in (super)-gravity, from new mathematics to all-loop amplitudes in N=4 Supersymmetric Yang-Mills Theory (SYM). In this talk, the speaker will review some recent progress, with focus on two topics: (1) a string-inspired new formulation for amplitudes in gauge theories and gravity, and double-copy between them; (2) new geometric structures underlying amplitudes which may hint at a “theory at infinity” for S-matrices.