Abstract
It is shown that the von Neumann algebra\(R_\mathfrak{B} \)(B) generated by any scalar local functionB(x) of the free fieldA 0(x) is equal either to\(R_\mathfrak{B} \)(A 0) or to\(R_\mathfrak{B} \)(:A 20 :). The latter statement holds if the state space space\(\mathfrak{H}_B \) obtained from the vacuum state by repeated application ofB(x) is orthogonal to the one particle subspace. In the proof of these statements, space-time limiting techniques are used.
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Langerholc, J., Schroer, B. On the structure of the von Neumann algebras generated by local functions of the free bose field. Commun.Math. Phys. 1, 215–239 (1965). https://doi.org/10.1007/BF01646306
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DOI: https://doi.org/10.1007/BF01646306