Кореляційна функція (квантова теорія поля)

Кореляці́йна фу́нкція — функціональне середнє (функціональне очікуване значення) добутку польових операторів[en] квантової теорії поля в різних точках дійсного простору[en]

де S — дія.

Для кореляційних функцій, що залежать від часу, мається на увазі застосування оператора впорядкування за часом .

Кореляційні функції також називають просто кореляторами.

Кореляційну функцію можна інтерпретувати фізично як амплітуду поширення частинки чи збудження.

Поняття (багаточастинкової) кореляційної функції (з відповідними змінами) також використовують у фізиці конденсованого стану[1].

Див. також

Примітки

  1. Н. М. Боголюбов[ru], «Многочастичные корреляционные функции бозе-газа в ловушке» [Архівовано 2021-10-23 у Wayback Machine.], Вопросы квантовой теории поля и статистической физики. 16, Зап. научн. сем. ПОМИ, 269, ПОМИ, СПб., 2000, 125—135; J. Math. Sci. (N. Y.), 115:1 (2003), 1954—1959

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