Correlation function (quantum field theory)

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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. Sometimes, the phrase Green's function is used not only for two-point functions, but for any correlators.

See also



  • Alexander Altland, Ben Simons (2006): Condensed Matter Field Theory Cambridge University Press