I have this exercise, where I am to integrate out the fluctuations in the order parameter δρ, but I don't really know how to do this. The integral is over r and imaginary time. Should I try to complete the square, so the correlation term between δρ and Θ drops out? In that case which shift of variables should I make?(adsbygoogle = window.adsbygoogle || []).push({});

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# Performing integration over field variable

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