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arXiv 1407.6736hep-th
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N=4的散射振幅与变形格拉斯曼

N=4 Scattering Amplitudes and the Deformed Grassmannian

Livia Ferro, Tomasz Lukowski, Matthias Staudacher

摘要:

前一段时间,N=4的超级杨-米尔斯理论的一般树级散射振幅被表示为某些格拉斯曼围道积分。这些显着的公式允许清楚地暴露的超共形,双超共形,和Yangian对称的振幅。利用可积性的思想,最近表明,振幅的构建块允许自然的多参数变形。然而,这种方法受到了批评,因为观察到似乎不可能将构建块重新组装成杨氏不变的变形非MHV振幅。在这份说明中,我们证明,变形可以简洁地概括为一个简单的修改措施的格拉斯曼积分,导致一个杨格尔不变变形的一般树级振幅。有趣的是,变形的积木出现在谱参数平面的极点的残留物。考虑到轮廓积分也包含循环级振幅的信息,我们希望变形在那里也是有用的。特别是,应用亚纯性参数,他们可能会被期望调节所有臭名昭著的红外发散。我们还指出了Gelfand超几何函数和量子Knizhnik-Zamolodchikov方程的关系。

英文摘要:

Some time ago the general tree-level scattering amplitudes of N=4 Super Yang-Mills theory were expressed as certain Grassmannian contour integrals. These remarkable formulas allow to clearly expose the super-conformal, dual super-conformal, and Yangian symmetries of the amplitudes. Using ideas from integrability it was recently shown that the building blocks of the amplitudes permit a natural multi-parameter deformation. However, this approach had been criticized by the observation that it seemed impossible to reassemble the building blocks into Yangian-invariant deformed non-MHV amplitudes. In this note we demonstrate that the deformations may be succinctly summarized by a simple modification of the measure of the Grassmannian integrals, leading to a Yangian-invariant deformation of the general tree-level amplitudes. Interestingly, the deformed building-blocks appear as residues of poles in the spectral parameter planes. Given that the contour integrals also contain information on the amplitudes at loop-level, we expect the deformations to be useful there as well. In particular, applying meromorphicity arguments, they may be expected to regulate all notorious infrared divergences. We also point out relations to Gelfand hypergeometric functions and the quantum Knizhnik-Zamolodchikov equations.

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