Thermal Field Theory Integration over the modes?

1. Jul 21, 2010

Phymath

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

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

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2. Jul 22, 2010

vanhees71

Last edited by a moderator: Apr 25, 2017