There is a 'folk theorem' I've encountered that goes something like this: trying to localize a relativistic particle indefinitely will result in the creation of other particles. This is sometimes taken as the physical explanation for the non-existence of relativistic position operators. (The eigenvectors of the Newton-Wigner operators are unphysical since they spread to the entire Universe in a finite time interval.) Can someone please give me references where such things are proved or at least made precise?
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