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arXiv 0902.0981hep-thhep-ph
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六维空间中的振幅和旋量螺旋度

Amplitudes and Spinor-Helicity in Six Dimensions

Clifford Cheung, Donal O'Connell

摘要:

旋量-螺旋度形式主义已经成为理解四维空间中无质量粒子S-矩阵的一个非常宝贵的工具。本文构造了一个六维旋量螺旋度形式,并应用它导出了Yang-Mills理论的三点树、四点树和五点树振幅的紧致表达式。使用KLT关系,这是一个简单的过程,以获得这些杨米尔斯振幅的线性化重力振幅,我们证明了这一点,通过写下引力三点和四点振幅。由于在六维空间中没有守恒螺旋性,这些振幅描述了在四维空间中所有可能的偏振态(以及卡鲁扎-克莱因激发)在降维时的散射。我们还简要地讨论了一个方便的制定BCFW递归关系在高维。

英文摘要:

The spinor-helicity formalism has become an invaluable tool for understanding the S-matrix of massless particles in four dimensions. In this paper we construct a spinor-helicity formalism in six dimensions, and apply it to derive compact expressions for the three, four and five point tree amplitudes of Yang-Mills theory. Using the KLT relations, it is a straightforward process to obtain amplitudes in linearized gravity from these Yang-Mills amplitudes; we demonstrate this by writing down the gravitational three and four point amplitudes. Because there is no conserved helicity in six dimensions, these amplitudes describe the scattering of all possible polarization states (as well as Kaluza-Klein excitations) in four dimensions upon dimensional reduction. We also briefly discuss a convenient formulation of the BCFW recursion relations in higher dimensions.

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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