Feynman rules for finite-temperature Green’s functions in an expanding universe
- 15 February 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 31 (4) , 689-698
- https://doi.org/10.1103/physrevd.31.689
Abstract
We derive Feynman rules for evaluating the real-time Green’s functions of a scalar field theory in a Robertson-Walker universe under the circumstance that at some initial time the system was in thermal equilibrium with density matrix exp[-βH()], where H() is the Hamiltonian at time .
Keywords
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