报告题目：New BCJ representations for one-loop amplitudes in gauge theories and gravity

报告人：张勇（中国科学院理论物理研究所）

报告时间：2017年10月11日（周三）上午10:00-12:00

报告地点：物理学院新楼5楼多功能厅

报告摘要：

We explain a procedure to manifest the Bern--Carrasco--Johansson duality between color and kinematics in n-point one-loop amplitudes of a variety of supersymmetric gauge theories. Explicit amplitude representations are constructed through a systematic reorganization of the integrands in the Cachazo--He--Yuan formalism. Our construction is independent on the amount of supersymmetry or the number of spacetime dimensions. The cancellations from supersymmetry multiplets in the loop as well as the resulting power counting of loop momenta is manifested along the lines of the corresponding superstring computations. The setup is used to derive the one-loop version of the Kawai--Lewellen--Tye formula for the loop integrands of gravitational amplitudes.

报告人简历：

2017 – present Institute of Theoretical Physics , Chinese Academy of Sciences， PhD in Theoretical Physics

2015 – 2017 Beijing Normal University， Master in Theoretical Physics

2011 – 2015 Sichuan University B.A. in Physics

邀请人：杜一剑副教授