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arXiv 0909.0229hep-th
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从扭率弦论到递归关系

From Twistor String Theory To Recursion Relations

Marcus Spradlin, Anastasia Volovich

摘要:

Witten的扭量弦论给出了一个神秘的公式[arXiv:hep-th/0403190],被称为树能级杨-米尔斯散射振幅的“连接处方”。我们推导出一个链接表示的连接处方傅立叶变换到混合坐标的扭量和双扭量变量。我们表明,它可以与其他表示的振幅通过应用整体留数定理变形的轮廓的集成。对于六个和七个粒子,我们明确地证明,某些轮廓变形重写的连接处方的BCFW表示,从而建立一个具体的联系威滕的扭量弦论理论和最近提出的Arkani-Hamed等人的N=4 SYM的S-矩阵的对偶制定。对积分轮廓的其他选择也会产生“中间处方”。对于更一般的振幅,我们期望有一个类似但更复杂的结构。

英文摘要:

Witten's twistor string theory gives rise to an enigmatic formula [arXiv:hep-th/0403190] known as the "connected prescription" for tree-level Yang-Mills scattering amplitudes. We derive a link representation for the connected prescription by Fourier transforming it to mixed coordinates in terms of both twistor and dual twistor variables. We show that it can be related to other representations of amplitudes by applying the global residue theorem to deform the contour of integration. For six and seven particles we demonstrate explicitly that certain contour deformations rewrite the connected prescription as the BCFW representation, thereby establishing a concrete link between Witten's twistor string theory and the dual formulation for the S-matrix of N=4 SYM recently proposed by Arkani-Hamed et. al. Other choices of integration contour also give rise to "intermediate prescriptions". We expect a similar though more intricate structure for more general amplitudes.

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