Abstract

Starting from Wigner’s theory of elementary systems and following a recent approach of Brunetti, Guido, and Longo also taken up by Schroer we define certain subspaces of localized wave functions in the underlying Hilbert space with the help of the theory of modular von-Neumann algebras of Tomita and Takesaki. We characterize the elements of these subspaces as boundary values of holomorphic functions in the sense of distribution theory and show that the corresponding holomorphic functions satisfy the sufficient conditions of the theorems of Paley–Wiener–Schwartz and Hörmander.

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