A. Zee, Quantum Field Theory in a Nutshell · Problem VII.4.3

Field Theory Redux

Physics — QFT

Problem

Show that if we had chosen to calculate

G(z) \equiv (1/N) \text{tr}(1/z - \phi)

, we would have to connect the two open ends of the quark propagator. We see that figures VII.4.5b and d lead to the same diagram for the calculation of

G(z)

in this way.

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