Abstract
IN SOME QUARTERS, AT LEAST, IT COUNTS as the “received view” that there cannot be a relativistic, quantum mechanical theory of (localizable) particles. In the attempt to reconcile quantum mechanics with relativity theory, that is, one is driven to a field theory; all talk about “particles” has to be understood, at least in principle, as talk about the properties of, and interactions among, quantized fields. I want to suggest, today, that it is possible to capture this thesis in a convincing “no-go theorem”. Indeed, it seems to me that various technical results on the “non-localizability” of particles in (so-called) relativistic quantum mechanics, going back some thirty years, are best understood as versions of such a theorem.1
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