arXiv 0809.45072008-09-25hep-th

Moyal非交换空间上扭曲Poincare对称性对QFT的影响

On the consequences of twisted Poincare' symmetry upon QFT on Moyal noncommutative spaces

Gaetano Fiore

备注：: Latex file, 21 pages
DOI：: 10.1142/9789812833556_0005

摘要：

我们在Chaichian et al. [12]，Wess [44]，Koch et al. [31]，Oeckl [34]的扭曲Poincare群下探讨了协方差Minkowski空间的Groenewold-Moyal-Weyl非对易版本上的相对论性量子场论（QFT）的相容公式的一些一般结果。我们认为，后者的一个适当的实施需要编织交换关系之间的任何一对坐标$\hat x,\hat y$生成两个不同的副本的空间，或等价的$\star$ -张量积$f(x)\star g(y)$（在阿盖里等的说法。[3]）之间的任何两个功能取决于$x,y$。那么所有的差异$(x-y)^μ$的行为就像它们未变形的对应物。强加（最小适应）怀特曼公理，人们发现$n$ -点函数满足与交换空间相同的一般性质。实际上，在计算时，人们发现（至少对于标量场），如果场是自由的，如果它们相互作用（我们通过时间序微扰理论处理相互作用），则$n$点函数作为坐标差的函数保持不变。主要的，令人惊讶的结果似乎是一个QFT物理等价于未变形的对应物（无论是否确认它，首先应该澄清$n$点函数和可观测量之间的关系，特别是S矩阵元素）。这些结果主要基于与J. Wess的联合工作[24]

英文摘要：

We explore some general consequences of a consistent formulation of relativistic quantum field theory (QFT) on the Groenewold-Moyal-Weyl noncommutative versions of Minkowski space with covariance under the twisted Poincare' group of Chaichian et al. [12], Wess [44], Koch et al. [31], Oeckl [34]. We argue that a proper enforcement of the latter requires braided commutation relations between any pair of coordinates $\hat x,\hat y$ generating two different copies of the space, or equivalently a $\star$-tensor product $f(x)\star g(y)$ (in the parlance of Aschieri et al. [3]) between any two functions depending on $x,y$. Then all differences $(x-y)^μ$ behave like their undeformed counterparts. Imposing (minimally adapted) Wightman axioms one finds that the $n$-point functions fulfill the same general properties as on commutative space. Actually, upon computation one finds (at least for scalar fields) that the $n$-point functions remain unchanged as functions of the coordinates' differences both if fields are free and if they interact (we treat interactions via time-ordered perturbation theory). The main, surprising outcome seems a QFT physically equivalent to the undeformed counterpart (to confirm it or not one should however first clarify the relation between $n$-point functions and observables, in particular S-matrix elements). These results are mainly based on a joint work [24] with J. Wess

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