Abstract
The truncated Wightman functions cannot decrease arbitrarily fast for large space-like separation of the arguments. For certain configurations they can fall off at most exponentially.
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Pohlmeyer, K. A note on the decrease of truncated Wightman functions for large space-like separation of the arguments. Commun.Math. Phys. 7, 271–273 (1968). https://doi.org/10.1007/BF01646660
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DOI: https://doi.org/10.1007/BF01646660