Validity of Feynman's prescription of disregarding the Pauli principle in intermediate states

Details Validity of Feynman's prescription of disregarding the Pauli principle in intermediate states Validity of Feynman's prescription of disregarding the Pauli principle in intermediate states

1998-12-24

arxiv.org/abs/quant-ph/9812073v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.59.2624

Regarding the Pauli principle in quantum field theory and in many-body quantum mechanics, Feynman advocated that Pauli's exclusion principle can be completely ignored in intermediate states of perturbation theory. He observed that all virtual processes (of the same order) that violate the Pauli principle cancel out. Feynman accordingly introduced a prescription, which is to disregard the Pauli principle in all intermediate processes. This ingeneous trick is of crucial importance in the Feynman diagram technique. We show, however, an example in which Feynman's prescription fails. This casts doubts on the general validity of Feynman's prescription.

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