New Structures and Formulations for S-matrices

by Dr Song He (Institute of Theoretical Physics,CAS)

Monday 25 Feb 2019, 16:00 → 17:30 Asia/Shanghai

Meeting Room 410,TDLI（Tsung-Dao Lee Library）

Abstract

In the past decades and especially the last one, powerful new tools and remarkable new structures for perturbative scattering amplitudes in QFT have been discovered. 
Apart from playing a prominent role in high-energy particle physics, these developments have important implications for a wide range of subjects: from string perturbation 
theory to multi-loop calculations in (super)-gravity, from new mathematics to all-loop amplitudes in N=4 SYM. 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.

Biography

After bachelor degrees on physics and mathematics, as well as PhD on theoretical physics from Peking University (2009), I worked as postdoc at Albert-Einstein Institute (2009-2012), 
joint postdoc at Perimeter Institute and Institute for Advanced Study (2012-2015). In Sep 2015, I jointed Institute of Theoretical Physics, CAS as an Associate Professor. My research 
is intended to answer fundamental questions in Quantum Field Theory, String Theory and Quantum Gravity, and in the past decade I have focused on scattering amplitudes in QFT 
and gauge/gravity duality. With Cachazo and Yuan, we have proposed a new formulation for S-matrices in QFT, which has opened up a new direction and changed our basic understanding 
about scattering of massless particles, such as gluons and gravitons.

Division

Particle and Nuclear