On the consequences of twisted Poincare' symmetry upon QFT on Moyal noncommutative spaces
Abstract
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 x, y generating two different copies of the space, or equivalently a -tensor product f(x) 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