论文标题
符号字母来自Plabic Graphs II：理性字母
Symbol Alphabets from Plabic Graphs II: Rational Letters
论文作者
论文摘要
已知N = 4个超阳米尔斯理论中N颗粒振幅的符号字母包含GR（4，N）的某些群集变量以及群集变量的某些代数函数。本系列中的第一篇论文：2007.00646侧重于n = 8个代数字母。在本文中，我们表明，如果允许C是GR _+（n-4，n）的顶部单元格的任意群集参数化，则可以通过求解c z = 0的矩阵方程来获得所有有理符号字母（实际上所有群集变量）。
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. The first paper arXiv:2007.00646 in this series focused on n=8 algebraic letters. In this paper we show that it is possible to obtain all rational symbol letters (in fact all cluster variables) by solving matrix equations of the form C Z = 0 if one allows C to be an arbitrary cluster parameterization of the top cell of Gr_+(n-4,n).
