Wilson Loop Diagrams and Positroids
Wilson Loop Diagrams and Positroids
复制标题
威尔逊环图和正类图
DOI:
10.1007/s00220-016-2659-y
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发表时间:
2016
影响因子:
2.4
通讯作者:
Agarwala S
中科院分区:
文献类型:
--
作者:
Agarwala S
In this paper, we study a new application of the positive Grassmannian to Wilson loop diagrams (or MHV diagrams) for scattering amplitudes in N= 4 Super Yang–Mill theory (N= 4 SYM). There has been much interest in studying this theory via the positive Grassmannians using BCFW recursion. This is the first attempt to study MHV diagrams for planar Wilson loop calculations (or planar amplitudes) in terms of positive Grassmannians. We codify Wilson loop diagrams completely in terms of matroids. This allows us to apply the combinatorial tools in matroid theory used to identify positroids (non-negative Grassmannians) to Wilson loop diagrams. In doing so, we find that certain non-planar Wilson loop diagrams define positive Grassmannians. While non-planar diagrams do not have physical meaning, this finding suggests that they may have value as an algebraic tool, and deserve further investigation.
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