Correlation function (quantum field theory)
|Quantum field theory|
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.
The correlation function can be interpreted physically as the amplitude for propagation of a particle or excitation between y and x. In the free theory, it is simply the Feynman propagator (for n = 2).
- Connected correlation function
- One particle irreducible correlation function
- Green's function (many-body theory)
- Partition function (mathematics)
- Peskin, Michael; Schroeder, David. An Introduction to Quantum Field Theory. Addison-Wesley.
- Alexander Altland, Ben Simons (2006). Condensed Matter Field Theory. Cambridge University Press.
- Schroeder, Daniel V. and Michael Peskin, An Introduction to Quantum Field Theory. Addison-Wesley.
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