报告题目：Soft Limits of Yang-Mills Amplitudes and Conformal Correlators

报告人：樊炜 博士（美国东北大学）

报告时间：2019年6月3号（周一）15:30 - 16:30

报告地点：天津大学新校区理学院256

报告摘要：

We study tree-level celestial amplitudes in Yang-Mills theory--Mellin transforms of multi-gluon scattering amplitudes that convert them into the correlators of conformal primary fields on two-dimensional celestial sphere. By using purely field-theoretical methods, we show that the soft conformal limit of celestial amplitudes, in which one of the primary field operators associated to gauge bosons becomes a dimension one current, is dominated by the contributions of low-energy soft particles. This result confirms conclusions reached by using Yang-Mills theory formulated in curvilinear coordinates, as pioneered by Strominger. By using well-known collinear limits of Yang-Mills amplitudes, we derive the OPE rules for the primary fields and the holomorphic currents arising in the conformally soft limit. The Ward identities following from OPE have 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 and Conformal Correlators. arXiv:1903.01676 (2019)
[2] Wei Fan, A.Fotopoulos, S.Stieberger, T.R.Taylor,  Sv-map between type I and heterotic sigma models. Nucl.Phys. B 930 195-218 (2018)
[3] Wei Fan, Wilson loop of the heterotic sigma model and the sv-map. Nucl.Phys. B 936 (2018) 615-637
[4] Wei Fan, Yan Xu, Bing Chen, Zhaoyang Chen, Xunli Feng, and C. H. Oh, Quantum phase transition of two-mode Bose-Einstein condensates with an entanglement order parameter, Phys. Rev. A 85, 013645 (2012).
[5] Bing Chen, Wei Fan, and Yan Xu, Adiabatic quantum state transfer in a nonuniform triple-quantum-dot system, Phys. Rev. A 83, 014301 (2011).

 

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