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arXiv 1807.05397math-phmath.MP
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SYM $N=4$中的威尔逊圈不参数化可定向空间

Wilson loops in SYM $N=4$ do not parametrize an orientable space

Susama Agarwala, Cameron Marcott

摘要:

本文研究SYM $N=4$中树级威尔逊圈参数化的几何空间。证明了该空间可以看作是Grassmannian的一个完全非负子空间$\mathcal{W}_{k,cn}$上的向量丛。此外,我们明确地表明,这个丛是不可定向的,在大多数情况下,并猜测,它是不可定向的,在其余的情况。利用格拉斯曼的Deodhar分解的组合学,我们确定子空间$Σ(W) \subset \mathcal{W}_{k,n}$,其中限制丛位于正格拉斯曼之外。最后,在探讨组合的Deodhar分解,我们给出了一个图解算法,用于读取方程确定每个Deodhar组件作为一个半代数集。

英文摘要:

In this paper we explore the geometric space parametrized by (tree level) Wilson loops in SYM $N=4$. We show that, this space can be seen as a vector bundle over a totally non-negative subspace of the Grassmannian, $\mathcal{W}_{k,cn}$. Furthermore, we explicitly show that this bundle is non-orientable in the majority of the cases, and conjecture that it is non-orientable in the remaining situation. Using the combinatorics of the Deodhar decomposition of the Grassmannian, we identify subspaces $Σ(W) \subset \mathcal{W}_{k,n}$ for which the restricted bundle lies outside the positive Grassmannian. Finally, while probing the combinatorics of the Deodhar decomposition, we give a diagrammatic algorithm for reading equations determining each Deodhar component as a semialgebraic set.

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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