报告题目：Soft Limits of Yang-Mills Amplitudes and Conformal Correlators
报告时间：2019-06-03 15:30 (星期一)
报告地点：天津大学新校区理学院256
报告人：樊炜博士（美国东北大学

报告摘要： 

 Westudy tree-level celestial amplitudes in Yang-Mills theory--Mellin transformsof multi-gluon scattering amplitudes that convert them into the correlators ofconformal primary fields on two-dimensional celestial sphere. By using purelyfield-theoretical methods, we show that the soft conformal limit of celestialamplitudes, in which one of the primary field operators associated to gaugebosons becomes a dimension one current, is dominated by the contributions oflow-energy soft particles. This result confirms conclusions reached by usingYang-Mills theory formulated in curvilinear coordinates, as pioneered byStrominger. By using well-known collinear limits of Yang-Mills amplitudes, wederive the OPE rules for the primary fields and the holomorphic currentsarising in the conformally soft limit. The Ward identities following from OPEhave the same form as the identities derived by using soft theorems.    

报告人简历：

樊炜博士，美国东北大学博士，山东科技大学学士与硕士。  

代表作： 

 1.Wei Fan, A.Fotopoulos, T.R.Taylor, Soft Limits of Yang-Mills Amplitudes andConformal Correlators. arXiv:1903.01676 (2019)  

 2.Wei Fan, A.Fotopoulos, S.Stieberger, T.R.Taylor,  Sv-map between type I and heterotic sigmamodels. Nucl.Phys. B 930 195-218 (2018)   

 3.Wei Fan, Wilson loop of the heterotic sigma model and the sv-map. Nucl.Phys. B936 (2018) 615-637   

 4.Wei Fan, Yan Xu, Bing Chen, Zhaoyang Chen, Xunli Feng, and C. H. Oh, Quantumphase transition of two-mode Bose-Einstein condensates with an entanglementorder parameter, Phys. Rev. A 85, 013645 (2012).   

 5.Bing Chen, Wei Fan, and Yan Xu, Adiabatic quantum state transfer in anonuniform triple-quantum-dot system, Phys. Rev. A 83, 014301 (2011).