何松 教授学术报告
Title: Root - TTbar Flows Unify 4D Duality-Invariant Electrodynamics and 2D Integrable Sigma Models
Speaker: Prof. Song He（何松）
Affiliation: Ningbo University（宁波大学)
Time: 16:00-17:00, Friday, 26th September, 2025 (UTC+8, Beijing Time)
Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)
Inviter: Jianfei Xu（许剑飞）
Abstract
We present a single, dimension–independent framework that links four–dimensional duality–invariant nonlinear electrodynamics to two–dimensional integrable sigma models. Both sectors are shown to obey the same first–order Courant–Hilbert equation, solved by a common generating function and an auxiliary–potential formulation. Within this structure, a discrete $\varphi$–parity acts as a selection rule, organizing deformation series into integer versus fractional powers. Two commuting deformations—an irrelevant parameter $\lambda$ and a marginal parameter $\gamma$—admit universal flow representations that recover root–$T\bar T$ dynamics and extend them in a controlled way. The construction yields closed–form families (generalized Born–Infeld, logarithmic, and $q$–deformed) and a new integrable model, all realized in 2D and 4D. These results replace case–by–case analyses with a unified route to solvable nonlinear theories, with immediate relevance to gauge dynamics, string–inspired effective actions, and integrable models.
Speaker
何松，宁波大学基础物理与量子科技研究院教授。主要从事引力理论、量子场论、弦论及其数学物理等相关问题的研究。目前的研究兴趣是通过弦论与场论中的对偶性理解引力的本质，以及利用规范/引力对偶方法研究量子场论中的非微扰问题。
The seminar will be broadcasted online by Zoom.
Interested people are free to join, without registration in advance.
The Zoom info is
URL: https://us02web.zoom.us/j/3854420225?pwd=SXY4eWJKOTBFZWJDaE16aXpTamY1QT09
Meeting ID: 385 442 0225
Passcode: yauc