报告题目:A graphic approach to gauge invariance induced identity
报 告 人:杜一剑 副教授 (武汉大学)
报告时间:2018年12月17日(星期一),上午10:00
邀 请 人:傅致豪
报告地点:欧亿6蓝狮注册 六层学术报告厅(致知楼3623)
报告摘要:
All tree-level amplitudes in Einstein-Yang-Mills (EYM) theory and gravity (GR) can be expanded in terms of color ordered Yang-Mills (YM) ones whose coefficients are polynomial functions of Lorentz inner products and are constructed by a graphic rule. Once the gauge invariance condition of any graviton is imposed, the expansion of a tree level EYM or gravity amplitude induces a nontrivial identity between color-ordered YM amplitudes. Being different from traditional amplitude relations (such as Kleiss-Kuijf (KK) and Bern-Carrasco-Johansson (BCJ) relations), the gauge invariance induced identity includes polarizations in the coefficients. In this talk, I will introduce the graphic expansion of EYM and GR amplitudes. By a refined graphic rule, I will show that the gauge invariance induced identities are just proper combinations of traditional BCJ relations. A graph-based BCJ relation will be established as a byproduct.
报告人简介:
报告人杜一剑,2005年毕业于浙江大学竺可桢学院取得学士学位,2010年浙江大学物理系取得博士学位。2010年-2015年先后在浙江大学、复旦大学、隆德大学(瑞典)从事博士后研究工作。2015年9月入职武汉大学物理科学与技术学院。研究方向为量子场论、弦论,近年来主要从事量子场论和弦论散射振幅新结构、新性质的研究。
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2018年11月20日