Summary
The Newton-Wigner position operator is rediscovered directly from a space-time description of quantum field theory which is based on the actual physical situation where particles travel between emitters and detectors. It avoids methods used in nonrelativistic quantum physics and so-called wave equations.
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Manoukian, E.B. Rediscovering the Newton-Wigner operator from a space-time description of quantum field theory. Nuov Cim A 103, 1495–1497 (1990). https://doi.org/10.1007/BF02820577
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DOI: https://doi.org/10.1007/BF02820577