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arXiv 1208.0841hep-thmath-phmath.MP
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从多边形威尔逊圈到自旋链及返回

From Polygon Wilson Loops to Spin Chains and Back

Amit Sever, Pedro Vieira, Tianheng Wang

摘要:

N=4 SYM中的威尔逊多边形威尔逊圈(WL)可以使用算子乘积展开根据色通量管(FT)顶部的过渡幅度来计算。这幅图在任何特胡夫特耦合值下都是有效的。到目前为止,它已被有效地用于弱耦合(WC)的情况下,只有一个单一的粒子是流动的。然而,在耦合的任何有限值处,无限数量的粒子在颜色FT的顶部流动。在这种方法中的一个主要的开放问题是如何处理在WC的通用多粒子状态。在本文中,我们研究了传播的任何数量的FT激发WC。我们首先将WL映射为局部算子的两个点函数之和。这张图使我们能够将为频谱问题开发的可积性技术翻译回WL。例如,在一个示例中,FT哈密尔顿算子可以表示为作用于循环的简单核。有了FT哈密顿量的显式表示,我们就可以平等地对待任何数量的粒子。我们用它来引导一些简单的情况下,两个粒子流动,双N2 MHV振幅。FT是可积的,因此有其他(无限集)守恒电荷。守恒电荷的母函数由多边形边间的单值矩阵构造而成。我们计算它的一些简单的例子,在领先的顺序在WC。在强耦合(SC),这些M的Y-系统的解决方案的主要成分。为了连接WC和SC计算,我们研究了一种情况下,无限数量的粒子传播已经在WC的领先秩序。我们得到一个精确的匹配之间的WC和SC女士,这场比赛是WL模拟著名的Frolov-Tseytlin限制WC和SC的描述变得相同。希望将WC和SC描述放在同一个基础上是理解所有循环结构的第一步。

英文摘要:

Null Polygon Wilson Loops (WL) in N=4 SYM can be computed using the Operator Product Expansion in terms of a transition amplitude on top of a color flux tube (FT). That picture is valid at any value of the 't Hooft coupling. So far it has been efficiently used at weak coupling (WC) in cases where only a single particle is flowing. At any finite value of the coupling however, an infinite number of particles are flowing on top of the color FT. A major open problem in this approach was how to deal with generic multi-particle states at WC. In this paper we study the propagation of any number of FT excitations at WC. We do this by first mapping the WL into a sum of two point functions of local operators. This map allows us to translate the integrability techniques developed for the spectrum problem back to the WL. E.g., the FT Hamiltonian can be represented as a simple kernel acting on the loop. Having an explicit representation for the FT Hamiltonian allows us to treat any number of particles on an equal footing. We use it to bootstrap some simple cases where two particles are flowing, dual to N2MHV amplitudes. The FT is integrable and therefore has other (infinite set of) conserved charges. The generating function of conserved charges is constructed from the monodromy (M) matrix between sides of the polygon. We compute it for some simple examples at leading order at WC. At strong coupling (SC), these Ms were the main ingredients of the Y-system solution. To connect the WC and SC computations, we study a case where an infinite number of particles are propagating already at leading order at WC. We obtain a precise match between the WC and SC Ms. That match is the WL analogue of the well known Frolov-Tseytlin limit where the WC and SC descriptions become identical. Hopefully, putting the WC and SC descriptions on the same footing is the first step in understanding the all loop structure.

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