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Correlation function (quantum field theory)

In quantum field theory, correlation functions, often referred to as correlators or Green's functions, are vacuum expectation values of time-ordered products of field operators. They are a key object of study in quantum field theory where they can be used to calculate various observables such as S-matrix elements, although they are not themselves…

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Correlation function (quantum field theory)

Nodes34
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Triples5
Avg. degree1.94
Density0.058824
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correlation displaystyle functions dots external phi s-matrix rangle diagrams field theory function langle using vacuum operators quantum right sum delta

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SubjectPredicateObjectConfidenceSrc
S-matrix elementsinstance ofThey are a key object of study in quantum field theory where they can be used to calculate various observables0.80text
although they are not themselves observablesinstance ofThey are a key object of study in quantum field theory where they can be used to calculate various observables0.80text
one-particle irreducible correlation functions.In the path integral formulationinstance ofBy excluding other sets of diagrams one can define other correlation functions0.80text
n-point correlation functions are written as a functional average G ninstance ofBy excluding other sets of diagrams one can define other correlation functions0.80text
polarization vectors for photons or spinor states for fermionsinstance ofFor non-scalar theories the reduction formula also introduces external state terms0.80text

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