Time: 14:00 (UTc/GMT+8:00,Beijing/Shanghai), Dec. 10 (Thur.), 2020
Venue: KITS Seminar Room, 4th floor, No. 7 Building, UCAS Zhong-Guan-Cun Campus [View on maps]

Speaker: Song He (ITP, CAS)

Abstract:

In the past decades, powerful computational tools and remarkable new structures for perturbative scattering amplitudes in QFT have been discovered. These developments have important implications not only for high-energy particle physics, but also for a wide range of subjects: from string perturbation theory to multi-loop calculations in (super)-gravity, from new mathematics to AdS/CFT. I will review some recent progress, focusing 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.