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arXiv 1012.6030hep-th
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关于散射振幅多面体的一个注记

A Note on Polytopes for Scattering Amplitudes

Nima Arkani-Hamed, Jacob L. Bourjaily, Freddy Cachazo, Andrew Hodges, Jaroslav Trnka

摘要:

本文继续研究广义动量扭量空间中散射振幅的多面体图,其中振幅与多面体的体积有关。通过一个简单的热身例子来说明CP^2中多边形的初等几何的基本思想,然后我们将1-圈MHV被积函数解释为CP^3 × CP^3中多面体的体积,可以将其看作是通过在乘积的每个CP^3中取威尔逊圈的几何对偶而得到的空间。然后,我们回顾了NMHV树振幅的多胞形图像,并给出了一个更直接、更内在的定义,即威尔逊环多边形的一个典型“正方形”的几何对偶,它存在于动量扭量空间向CP的某种扩张中^[4]。在这两种情况下,一类自然的多面体三角剖分产生了振幅的BCFW/CSW表示;另一类三角剖分产生了一种引人注目的新形式,它既非常简单,又明显是循环的和局部的。

英文摘要:

In this note we continue the exploration of the polytope picture for scattering amplitudes, where amplitudes are associated with the volumes of polytopes in generalized momentum-twistor spaces. After a quick warm-up example illustrating the essential ideas with the elementary geometry of polygons in CP^2, we interpret the 1-loop MHV integrand as the volume of a polytope in CP^3x CP^3, which can be thought of as the space obtained by taking the geometric dual of the Wilson loop in each CP^3 of the product. We then review the polytope picture for the NMHV tree amplitude and give it a more direct and intrinsic definition as the geometric dual of a canonical "square" of the Wilson-Loop polygon, living in a certain extension of momentum-twistor space into CP^4. In both cases, one natural class of triangulations of the polytope produces the BCFW/CSW representations of the amplitudes; another class of triangulations leads to a striking new form, which is both remarkably simple as well as manifestly cyclic and local.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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