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arXiv · hep-ph/9510248

The Finite-Temperature Feynman Propagator in Operator Form

H. Arthur Weldon
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Abstract

In momentum space the Feynman propagator $D_{F}(k)$ at non-zero temperature is defined by a simple dispersion relation with the familiar property of being an even function of $k^{0}$ and analytic for Re$(k^{0})^{2}>0$. The coordinate space form of the propagator $D_{F}(x)$ is expressed directly in terms of matrix elements of the field operator and requires a new type of operator ordering.

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H. Arthur Weldon. 1995-10-09. The Finite-Temperature Feynman Propagator in Operator Form. https://doi.org/10.1103/physrevd.53.7265

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