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arXiv 1104.3873hep-th
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d维单圈N = 4个超级杨米尔斯散射振幅,与开弦和多边形威尔逊圈的关系

One-loop N = 4 super Yang-Mills scattering amplitudes in d dimensions, relation to open strings and polygonal Wilson loops

Robert M. Schabinger

摘要:

在这篇综述中,我们讨论了一些最近的发展有关的单圈N = 4超级杨米尔斯散射振幅计算的所有订单中的电子。单圈规范理论的计算通常是在ε ^0阶进行的,因为当ε趋于零时,ε的高阶贡献在极限处消失了。然而,我们将证明高阶贡献实际上是非常有用的。在最大超对称杨-米尔斯的背景下,我们考虑两个例子来详细说明我们的观点。首先,我们专注于计算与胶子外部状态,并认为N = 4超对称性意味着一个简单的关系,所有的订单在单圈N = 4超级杨米尔斯振幅和第一和第二弦修正类似的树级超弦振幅。对于我们的第二个例子,我们将推导出一个新的结果,所有的订单在单圈超级振幅的平面六粒子NMHV散射,一个对象,它允许一个容易地获得六点NMHV振幅与任意外部状态。然后,我们将讨论的相关性,这种计算的评价的比率的平面两个回路六点NMHV超级振幅的平面两个回路六点MHV超级振幅,一个数量,预计有显着的属性,并一直是最近的调查的主题。

英文摘要:

In this review we discuss some recent developments related to one-loop N = 4 super Yang-Mills scattering amplitudes calculated to all orders in epsilon. It is often the case that one-loop gauge theory computations are carried out to order epsilon^0, since higher order in epsilon contributions vanish in the limit as epsilon goes to zero. We will show, however, that the higher order contributions are actually quite useful. In the context of maximally supersymmetric Yang-Mills, we consider two examples in detail to illustrate our point. First we concentrate on computations with gluonic external states and argue that N = 4 supersymmetry implies a simple relation between all-orders-in-epsilon one-loop N = 4 super Yang-Mills amplitudes and the first and second stringy corrections to analogous tree-level superstring amplitudes. For our second example we will derive a new result for the all-orders-in-epsilon one-loop superamplitude for planar six-particle NMHV scattering, an object which allows one to easily obtain six-point NMHV amplitudes with arbitrary external states. We will then discuss the relevance of this computation to the evaluation of the ratio of the planar two-loop six-point NMHV superamplitude to the planar two-loop six-point MHV superamplitude, a quantity which is expected to have remarkable properties and has been the subject of much recent investigation.

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