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Physics
Quantum Physics
Why "Green's function" is used more than "correlations" in QFT?
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[QUOTE="atyy, post: 6171352, member: 123698"] In quantum mechanics, one can find that sandwiching an operator between a bra and ket gives the expectation value, so it is the same as the expectation value in probability (maybe the only difference is that it is more often called the expected value). [URL]https://en.wikipedia.org/wiki/Expectation_value_(quantum_mechanics)[/URL] Some quirks are just historical like partition function instead of characteristic function, and connected correlation function instead of cumulant because of the Feynman diagrams for the correlations. [/QUOTE]
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Physics
Quantum Physics
Why "Green's function" is used more than "correlations" in QFT?
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