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arXiv 1002.5029hep-th
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弦论中的在壳递归

On-shell Recursion in String Theory

Rutger H. Boels, Daniele Marmiroli, Niels A. Obers

摘要:

我们证明了在平坦背景下所有开弦论盘振幅都服从Britto-Cachazo-Feng-Witten(BCFW)在壳递归关系,直到运动学不变量上的一个可能的现实条件。同样适用于树水平闭弦振幅的参数也被给出。非相邻的BCFW移位通过单值关系与相邻移位相关,为此我们提供了一种新的基于CFT的推导。所有可能的递归关系都由老式的弦对偶性联系起来。场论分析的振幅涉及胶子明确表明是光滑的玻色弦以及超弦。除了证明之外,还提出了一个基于底层CFT的不太严格但更有力的论点,这表明该技术可以扩展到弦论中更一般的环境。这是说明了一个讨论的开弦在一个恒定的B-场背景和封闭弦的水平上的球。

英文摘要:

We prove that all open string theory disc amplitudes in a flat background obey Britto-Cachazo-Feng-Witten (BCFW) on-shell recursion relations, up to a possible reality condition on a kinematic invariant. Arguments that the same holds for tree level closed string amplitudes are given as well. Non-adjacent BCFW-shifts are related to adjacent shifts through monodromy relations for which we provide a novel CFT based derivation. All possible recursion relations are related by old-fashioned string duality. The field theory limit of the analysis for amplitudes involving gluons is explicitly shown to be smooth for both the bosonic string as well as the superstring. In addition to a proof a less rigorous but more powerful argument based on the underlying CFT is presented which suggests that the technique may extend to a much more general setting in string theory. This is illustrated by a discussion of the open string in a constant B-field background and the closed string on the level of the sphere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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