报告摘要： Scattering amplitudes are critical physics quantities in high-energy physics and bridge theories and experiments. Modern methods for scattering amplitudes

improve tremendously traditional Feynman methods and provide more efficient ways for computations. Physical properties of the scattering amplitudes are much easier to

investigate through modern methods, furthermore, these properties can provide auxiliary information for amplitude constructions. A new perspective of scattering amplitudes

is treating them as vectors: solving the on-shell gauge invariance, locality and symmetry constraints gives all possible tensor structures that can appear in a scattering

amplitude with fixed field content, and every amplitude must be a vector in the space spanned by these tensor structures. This spanning is applied to both classical and

quantum level amplitudes, while coefficients of tensor structures should be determined respectively.

报告人介绍：罗慧，2008年本科毕业于浙江大学；2013获浙江大学理学博士学位；2013年10月至2015年9月在意大利国际高等研究院、意大利国家核物理研究所帕多瓦分所和帕多瓦大学从事博士后研究工作；2015年至今为德国汉堡大学博士后。致力于量子场论、超对称理论和粒子物理基本理论的研究。目前主要研究方向为场论、引力理论及超越理论（如超对称理论）中散射振幅的计算方法和性质。

邀请人：杜一剑副教授