报告题目：A Journey on Riemann Spheres: From Scattering Equations to Amplitudes and Form Factors
报告人：刘正文博士（Université catholique de Louvain, Belgium）
报告摘要：The Cachazo-He-Yuan formalism expresses the S-matrix as a multiple integral over the moduli space of Riemann spheres with marked points, which is localised by a set of the scattering equations, for various field theories in any number of spacetime dimensions. In this talk, I will give a short introduction to the basic aspects of the scattering equations and CHY formulation, and then will also present some recent developments in this field with a special focus on four-dimensional spacetime.
报告题目: Soft theorems, memories and asymptotic symmetries
报告摘要：Soft theorems, memory effects, and asymptotic symmetries are shown in recent years to be mathematically equivalent. In this talk, I will give an overview of this fascinating triangle equivalence. In particular, I will explain in detail a very recent prescription to realize this triangle relation beyond the leading order. I will also comment on the extension of this triangle relation in arbitrary even dimensions.