Feynman rules for finite-temperature Green's functions in an expanding universe

Details Feynman rules for finite-temperature Green's functions in an expanding universe Feynman rules for finite-temperature Green's functions in an expanding universe

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrvd..31..689s&link_type=abstract

Physical Review D (Particles and Fields), Volume 31, Issue 4, 15 February 1985, pp.689-698

Physics

Condensed Matter

Statistical Mechanics

59

Lagrangian And Hamiltonian Approach, Theory Of Quantized Fields, Quantum Statistical Mechanics, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

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 t0 the system was in
thermal equilibrium with density matrix exp[-βH(t0)],
where H(t0) is the Hamiltonian at time t0.

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