振幅面与NMHV符号字母在两个环上的边界
Boundaries of Amplituhedra and NMHV Symbol Alphabets at Two Loops
摘要:
在arXiv:1711.11507的续集中,我们对与确定平面$\mathcal{N}=4$超杨-米尔斯理论中一般双环振幅的分支点有关的振幅面的边界进行了分类。我们解释了与外壳上图的连接,这是一个有用的交叉检查。我们确定的分支点的所有两个回路NMHV振幅通过解决朗道方程的相关配置,从而导致一个猜想的符号字母表的所有这样的振幅。
英文摘要:
In this sequel to arXiv:1711.11507 we classify the boundaries of amplituhedra relevant for determining the branch points of general two-loop amplitudes in planar $\mathcal{N}=4$ super-Yang-Mills theory. We explain the connection to on-shell diagrams, which serves as a useful cross-check. We determine the branch points of all two-loop NMHV amplitudes by solving the Landau equations for the relevant configurations and are led thereby to a conjecture for the symbol alphabets of all such amplitudes.
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