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arXiv 0903.0380hep-thhep-ph
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非交换S-矩阵

The Noncommutative S-Matrix

Suvrat Raju

摘要:

作为一个简单的例子,最近开发的壳层技术适用于非局部理论,我们研究的S-矩阵的非对易规范理论。在复平面上,这个S-矩阵具有本质的奇异性,这标志着理论的非局部行为。尽管如此,我们表明,树级振幅可以得到BCFW型递归关系。在一个循环中,我们找到了主积分的完全基(这个基大于普通理论中的相应基)。任何单圈非对易振幅都可以写成这些积分的线性组合,其系数与树振幅的乘积有关。我们证明了非对易的N=4 SYM理论与普通的N=4 SYM理论一样,具有结构简单的S-矩阵。

英文摘要:

As a simple example of how recently developed on-shell techniques apply to nonlocal theories, we study the S-matrix of noncommutative gauge theories. In the complex plane, this S-matrix has essential singularities that signal the nonlocal behavior of the theory. In spite of this, we show that tree-level amplitudes may be obtained by BCFW type recursion relations. At one loop we find a complete basis of master integrals (this basis is larger than the corresponding basis in the ordinary theory). Any one-loop noncommutative amplitude may be written as a linear combination of these integrals with coefficients that we relate to products of tree amplitudes. We show that the noncommutative N=4 SYM theory has a structurally simple S-matrix, just like the ordinary N=4 SYM theory.

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