平面图的符号字母表
Symbol Alphabets from Plabic Graphs
摘要:
在N=4的超杨-米尔斯理论中,n粒子振幅的符号表包含了Gr(4,n)的某些簇变量以及簇变量的某些代数函数。在本文中,我们提出了一个算法计算这些符号字母从plabic图通过求解矩阵方程的形式CZ = 0的关联功能Gr(m,n)的某些细胞的参数化的Gr(k,n)的plabic图索引。对于m=4和n=8,我们表明,这种关联精确地再现了18个代数符号字母的双回路NMHV八点振幅从四个plabic图。
英文摘要:
Symbol alphabets of n-particle amplitudes in N=4 super-Yang-Mills theory are known to contain certain cluster variables of Gr(4,n) as well as certain algebraic functions of cluster variables. In this paper we suggest an algorithm for computing these symbol alphabets from plabic graphs by solving matrix equations of the form C Z = 0 to associate functions on Gr(m,n) to parameterizations of certain cells of Gr(k,n) indexed by plabic graphs. For m=4 and n=8 we show that this association precisely reproduces the 18 algebraic symbol letters of the two-loop NMHV eight-point amplitude from four plabic graphs.
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