Correlation function (quantum field theory)
|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 the 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.
- Connected correlation function
- One particle irreducible correlation function
- Green's function (many-body theory)
- Partition function (mathematics)
- Alexander Altland, Ben Simons (2006): Condensed Matter Field Theory Cambridge University Press
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