Question: Verify the revised Wicks theorem (8.13.7) explicitly for the thermal average of four operators, (a (t)b (t)b (1)a (12)). k
Verify the revised Wick’s theorem (8.13.7) explicitly for the thermal average of four operators,![]()

(a (t)b (t)b (1)a (12)). k
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The term of interest is ak7b7b 72a 72 T Since the a and b opera tors commute proving Wicks theorem a... View full answer
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