(1) How does one obtain the density matrix formalism for quantum fields from the path integral?(adsbygoogle = window.adsbygoogle || []).push({});

(2) Suppose I have a box containing interacting particles of different kinds. Is it possible to incorporate into the density matrix formalism both a non-zero temperature T as well as a time t dependence on the distribution f(T,t,p) of the various particles? (I've seen treatments on finite temperature field theory, where imaginary time is identified with inverse temperature, but I'm wondering how we can include both T and t.)

Thanks for any input.

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# Density matrix for QFT from the path integral?

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