Question: Verify Wicks theorem explicitly for the case of four operators, namely two creation operators and two destruction operators for bosons in the same state k(vector).

Verify Wick’s theorem explicitly for the case of four operators, namely two creation operators and two destruction operators for bosons in the same state k(vector). There are 4! = 24 possible time orderings, but just pick two possible orderings to verify.

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Let the four operators be A B Ct3 and D with the condition t t2 t3 t4 Then the timeorde... View full answer

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