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arXiv 1806.01765hep-th
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4-3-5圈的粒子幅面体学

4-particle Amplituhedronics for 3-5 Loops

Junjie Rao

摘要:

本文沿着1712.09990和1712.09994的方向,从正几何的角度,继续挖掘4粒子振幅面体的更多有趣的方面,以便更好地理解平面N=4 SYM对所有圈阶的4粒子被积函数。在3-loop顺序,我们引入了一个更精细的解剖的振幅面体,以了解其基本结构,并最大限度地简化其直接计算,通过充分利用其对称性以及有效的蒙德里安方式重组所有贡献件。虽然有了很大的改进,但这种方法在4环上立即遇到了技术瓶颈。尽管如此,我们还是设法通过模仿传统的(广义的)么正割来减轻这个困难,这就是所谓的正割。给定一个对偶共形不变(DCI)环积分的基,利用其dlog形式通过正性条件求出每个DCI拓扑的系数。明确的例子包括所有2+5非梯级规则拓扑分别在4和5循环。这些结果与前人的研究结果非常吻合,证实了振幅面到5圈的有效性,并提出了一种确定每个不同DCI圈积分系数的新方法。

英文摘要:

Following the direction of 1712.09990 and 1712.09994, this article continues to excavate more interesting aspects of the 4-particle amplituhedron for a better understanding of the 4-particle integrand of planar N=4 SYM to all loop orders, from the perspective of positive geometry. At 3-loop order, we introduce a much more refined dissection of the amplituhedron to understand its essential structure and maximally simplify its direct calculation, by fully utilizing its symmetry as well as the efficient Mondrian way for reorganizing all contributing pieces. Although significantly improved, this approach immediately encounters its technical bottleneck at 4-loop. Still, we manage to alleviate this difficulty by imitating the traditional (generalized) unitarity cuts, which is to use the so-called positive cuts. Given a basis of dual conformally invariant (DCI) loop integrals, we can figure out the coefficient of each DCI topology using its dlog form via positivity conditions. Explicit examples include all 2+5 non-rung-rule topologies at 4- and 5-loop respectively. These results remarkably agree with previous knowledge, which confirms the validity of amplituhedron up to 5-loop and develops a new approach of determining the coefficient of each distinct DCI loop integral.

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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