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arXiv 0705.4305hep-th
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无质量粒子S-矩阵的相容性条件

Consistency Conditions on the S-Matrix of Massless Particles

Paolo Benincasa, Freddy Cachazo

摘要:

本文在四维闵可夫斯基时空中引入了一组关于任意自旋无质量粒子理论的S-矩阵的相容性条件。我们发现,在大多数情况下,来自条件的约束,只能满足,如果S-矩阵是平凡的。我们的条件适用于四粒子散射振幅可以通过最近的技术,称为BCFW建设从三粒子的理论。我们把这一类的理论称为可建构的。我们提出了一个程序进行系统的搜索可构建的理论,可以有非平凡的S-矩阵。作为例证,我们提供了简单的证明已经知道的事实,如自旋$s > 2$非平凡的S-矩阵的不可能性,几个自旋2相互作用的粒子的不可能性和自旋2和自旋3/2粒子的理论的唯一性。

英文摘要:

We introduce a set of consistency conditions on the S-matrix of theories of massless particles of arbitrary spin in four-dimensional Minkowski space-time. We find that in most cases the constraints, derived from the conditions, can only be satisfied if the S-matrix is trivial. Our conditions apply to theories where four-particle scattering amplitudes can be obtained from three-particle ones via a recent technique called BCFW construction. We call theories in this class constructible. We propose a program for performing a systematic search of constructible theories that can have non-trivial S-matrices. As illustrations, we provide simple proofs of already known facts like the impossibility of spin $s > 2$ non-trivial S-matrices, the impossibility of several spin 2 interacting particles and the uniqueness of a theory with spin 2 and spin 3/2 particles.

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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