报告题目：Hidden Adler zero and Soft theorem for Inflationary perturbations

报 告 人：Du Zong-Zhe 杜宗哲 (University of Nottingham)

报告时间：2025年1月13日13：30

报告地点：物理楼W260

内容摘要：Soft limits of scattering amplitudes play a crucial role in identifying the infrared (IR) structures of effective field theories (EFTs). In this talk, I will briefly introduce the success of the S-matrix program, and the techniques used to classify scalar EFTs, providing examples along the way. I will then address the problem of singular behaviors in cubic vertices under soft limits. A schematic derivation of the soft theorem will be presented, demonstrating that by properly ordering the limits—soft, on-shell, and epsilon—the cubic conundrum is naturally resolved. Next , I will discuss a soft theorem for the EFT of inflation, which holds to all orders in perturbation theory, and show how it determines the Wilson coefficients up to the known degrees of freedom. Finally, I will comment on the possible implication of the limit order on Weinberg soft graviton theorem.

报告人简介：My name is Du Zong-Zhe and I'm doing my PhD in University of Nottingham, I mainly focus on the symmetry breaking aspect of quantum IR observables in particle physics, gravity and early universe, I like most aspects of theoretical physics in general :)