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N-point function calculation from a generating function

  1. Mar 4, 2012 #1
    If a have ln Z[J] = ∫ J²f(t)dt+ a∫ J³dt + b∫ J^4dt, where J=J(t), and I would like to get the 3-point and 4-point functions, how do I proceed?

    I have tried to use the regular formula for the n-point function, when you derive Z[J] n times in relation to J(t_1)...J(t_n) and after applies J=0, but it doesn't make sense for me, since all the n-point functions will be zero.

    Actually, I think this particular Z[J] pretty strange because its integrals are not linear in J(t) as I used to see.

    So, could someone give me a hint?

  2. jcsd
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