Correlation function (quantum field theory)

In quantum field theory, the (real space) n-point correlation function is defined as the functional average (functional expectation value) of a product of field operators at different positions

For time-dependent correlation functions, the time-ordering operator is included.

Correlation functions are also called simply correlators.

The correlation function can be interpreted physically as the amplitude for propagation of a particle or excitation between y and x.

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