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arXiv 1808.02605hep-th
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杂种优势西格玛模型的威尔逊圈和SV图

Wilson loop of the heterotic sigma model and the sv-map

Wei Fan

摘要:

单值投影(sv)是杂化超弦理论和开超弦理论中规范玻色子散射振幅之间的关系。最近我们从非线性西格玛模型的角度研究了sv [1],其中开弦西格玛模型的规范物理是在威尔逊圈表象下,而杂化弦西格玛模型的规范物理是在费米子表象下,因为在杂化情形下没有威尔逊圈表象。在那里,我们表明,sv来自于一个和的杂合顶点在复平面上的6个径向排序。在本文中,我们提出了一个威尔逊圈表示的杂种优势的情况下,并使用威尔逊圈表示来证明,sv来自一个和的两个相反方向的轮廓的杂种优势西格玛模型。我们首先证明了在费米子表象中,威尔逊圈是费米子场的精确传播子,它承载了杂化弦的规范物理。然后,通过探讨威尔逊圈的几何结构,并将非交换的Stokes定理[2],[3],[4]推广到费米子情形,我们构造了杂化弦西格玛模型在威尔逊圈中的作用量。然后,我们计算了一些三圈和四圈图作为例子,以显示如何从威尔逊圈的轮廓的总和$ζ_2$和$ζ_3$的sv产生。最后,我们推测,这种总和的轮廓的威尔逊圈是背后的机制SV的一般情况下。

英文摘要:

The single-valued projection (sv) is a relation between scattering amplitudes of gauge bosons in heterotic and open superstring theories. Recently we have studied sv from the aspect of nonlinear sigma models [1], where the gauge physics of open string sigma model is under the Wilson loop representation but the gauge physics of heterotic string sigma model is under the fermionic representation since the Wilson loop representation is absent in the heterotic case. There we showed that the sv comes from a sum of six radial orderings of heterotic vertices on the complex plane. In this paper, we propose a Wilson loop representation for the heterotic case and using the Wilson loop representation to show that sv comes from a sum of two opposite-directed contours of the heterotic sigma model. We firstly prove that the Wilson loop is the exact propagator of the fermion field that carry the gauge physics of the heterotic string in the fermionic representation. Then we construct the action of the heterotic string sigma model in terms of the Wilson loop, by exploring the geometry of the Wilson loop and by generalizing the nonabelian Stokes's theorem [2], [3], [4] to the fermionic case. After that, we compute some three loop and four loop diagrams as an example, to show how the sv for $ζ_2$ and $ζ_3$ arises from a sum of the contours of the Wilson loop. Finally we conjecture that this sum of contours of the Wilson loop is the mechanism behind the sv for general cases.

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