The Finite-Temperature Feynman Propagator in Operator Form

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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References in corpus (4)

• High Temperature Response Functions and the Non-Abelian Kubo Formula
• Towards a Relativistic KMS Condition
• Transformations of real-time finite-temperature Feynman rules
• Analytic Continuation of Thermal $N$-Point Functions from Imaginary- to Real-Energies