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arXiv 1105.2565hep-th
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自对偶扇形的运动代数

The Kinematic Algebra From the Self-Dual Sector

Ricardo Monteiro, Donal O'Connell

摘要:

我们在Yang-Mills理论的自对偶扇区中确定了一个自同态李代数,并证明了它决定了全理论中树能级MHV振幅的运动学分子。这些振幅可以从只有立方顶点的费曼图中计算出来,费曼图用杨-米尔斯色代数和双同态代数的结构常数来修饰。因此,后者的代数是对偶的颜色代数,在这个意义上建议的工作伯尔尼,卡拉斯科和约翰松。我们进一步研究微扰引力,无论是在自对偶和在MHV部门,发现该理论的运动分子是杨米尔斯分子的BCJ平方。

英文摘要:

We identify a diffeomorphism Lie algebra in the self-dual sector of Yang-Mills theory, and show that it determines the kinematic numerators of tree-level MHV amplitudes in the full theory. These amplitudes can be computed off-shell from Feynman diagrams with only cubic vertices, which are dressed with the structure constants of both the Yang-Mills colour algebra and the diffeomorphism algebra. Therefore, the latter algebra is the dual of the colour algebra, in the sense suggested by the work of Bern, Carrasco and Johansson. We further study perturbative gravity, both in the self-dual and in the MHV sectors, finding that the kinematic numerators of the theory are the BCJ squares of the Yang-Mills numerators.

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