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arXiv 0908.0738hep-thhep-ph
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Poincaré代数的协变表示理论及其某些推广

Covariant representation theory of the Poincaré algebra and some of its extensions

Rutger H. Boels

摘要:

在过去的几年里,对涉及无质量四维粒子的规范理论振幅的计算有了很大的进展。其中的核心要素之一是精确跟踪所涉及粒子的庞加莱代数量子数的能力。从技术上讲,这是最容易做到的使用著名的四维旋量螺旋度方法。在这篇文章中,一个自然的推广到所有的维度高于4的基础上的表示理论的庞加莱代数的协变版本。所有可能的偏振态,玻色子和费米子的协变表达式,构造。对于费米子态,分析直接导致纯旋量。对壳层上超对称代数表示理论的自然扩展导致了从四维开始的任意整数维中具有无质量或有质量支腿的散射振幅的超对称沃德恒等式的初等推导。作为一个概念验证的应用,在平面背景下的(超)杨-米尔斯理论、爱因斯坦(超)引力和超弦理论中提出了四维中螺旋度消失等振幅的高维模拟。

英文摘要:

There has been substantial calculational progress in the last few years for gauge theory amplitudes which involve massless four dimensional particles. One of the central ingredients in this has been the ability to keep precise track of the Poincare algebra quantum numbers of the particles involved. Technically, this is most easily done using the well-known four dimensional spinor helicity method. In this article a natural generalization to all dimensions higher than four is obtained based on a covariant version of the representation theory of the Poincare algebra. Covariant expressions for all possible polarization states, both bosonic and fermionic, are constructed. For the fermionic states the analysis leads directly to pure spinors. The natural extension to the representation theory of the on-shell supersymmetry algebra results in an elementary derivation of the supersymmetry Ward identities for scattering amplitudes with massless or massive legs in any integer dimension from four onwards. As a proof-of-concept application a higher dimensional analog of the vanishing helicity-equal amplitudes in four dimensions is presented in (super) Yang-Mills theory, Einstein (super-)gravity and superstring theory in a flat background.

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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