Reconstruction in quantum field theory with a fundamental length

Details Reconstruction in quantum field theory with a fundamental length Reconstruction in quantum field theory with a fundamental length

2010-12-16

arxiv.org/abs/1012.3546v1

J.Math.Phys.51:093520,2010

Physics

Mathematical Physics

LaTeX, 23 pages, no figures

Scientific paper

10.1063/1.3483691

In this paper, we establish an analog of Wightman's reconstruction theorem for nonlocal quantum field theory with a fundamental length. In our setting, the Wightman generalized functions are defined on test functions analytic in a complex l-neighborhood of the real space and are localizable at scales large compared to l. The causality condition is formulated as continuity of the field commutator in an appropriate topology associated with the light cone. We prove that the relevant function spaces are nuclear and derive the kernel theorems for the corresponding classes of multilinear functionals, which provides the basis for the reconstruction procedure. Special attention is given to the accurate determination of the domain of the reconstructed quantum fields in the Hilbert space of states. We show that the primitive common invariant domain must be suitably extended to implement the (quasi)localizability and causality conditions.

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