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arXiv 2009.05607hep-th
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正几何、局部三角剖分和振幅面体的对偶

Positive geometry, local triangulations, and the dual of the Amplituhedron

Enrico Herrmann, Cameron Langer, Jaroslav Trnka, Minshan Zheng

摘要:

本文系统地研究了平面最大超对称杨-米尔斯理论中散射振幅的振幅面体构造中出现的\emph{local positive spaces}。我们表明,所有的局部正空间相关的单圈MHV振幅的特征在于某些符号翻转条件,并与令人惊讶的简单的对数形式。在最大符号翻转的情况下,它们是有限的单圈八边形。符号翻转空间的特定组合可以被粘到新的局部正几何中。这些对应于出现在MHV单圈振幅的局部展开中的局部五边形被积函数。我们表明,几何上,这些五边形做\emph{not}三角形原来的振幅面体空间,而是它的孪生“振幅面体素数。“这种新的几何形状具有与振幅面体相同的边界结构(因此具有相同的对数形式),但作为几何空间,在体积上有所不同。在某些二维边界上,振幅面体几何简化为多边形,我们检查两个空间映射到同一个对偶多边形。有趣的是,我们发现五边形内部三角形的对偶空间。这直接证明了手征五边形是尚未发现的对偶振幅面体的天然构建块。

英文摘要:

We initiate the systematic study of \emph{local positive spaces} which arise in the context of the Amplituhedron construction for scattering amplitudes in planar maximally supersymmetric Yang-Mills theory. We show that all local positive spaces relevant for one-loop MHV amplitudes are characterized by certain sign-flip conditions and are associated with surprisingly simple logarithmic forms. In the maximal sign-flip case they are finite one-loop octagons. Particular combinations of sign-flip spaces can be glued into new local positive geometries. These correspond to local pentagon integrands that appear in the local expansion of the MHV one-loop amplitude. We show that, geometrically, these pentagons do \emph{not} triangulate the original Amplituhedron space but rather its twin "Amplituhedron-Prime." This new geometry has the same boundary structure as the Amplituhedron (and therefore the same logarithmic form) but differs in the bulk as a geometric space. On certain two-dimensional boundaries, where the Amplituhedron geometry reduces to a polygon, we check that both spaces map to the same dual polygon. Interestingly, we find that the pentagons internally triangulate that dual space. This gives a direct evidence that the chiral pentagons are natural building blocks for a yet-to-be discovered dual Amplituhedron.

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