Hey guys, I have a doubt.(adsbygoogle = window.adsbygoogle || []).push({});

I was wondering if it is possible to have a generating function Z[J] where its integral has not a linear dependence on J(t), but a quadratic or even cubic dependence, like Z[J]=∫Dq exp{S[q] + ∫ J²(t) q(t)dt}, and how this would alter the calculation of the n-point functions.

Thaks!

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# Generating function of n-point function

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