The question is more of a mathematical question then one about physics in the attached file between equations 6 and 7 it says "integration over the modes" i don't know how they go from the integration measure(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\int D\phi \rightarrow \int D\phi_1 D\phi_2...D\phi_N

[/tex]

any advice would be helpful, thanks in advance!

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# Thermal Field Theory Integration over the modes?

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