Thermal green functions in an expanding universe

Details Thermal green functions in an expanding universe Thermal green functions in an expanding universe

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nuphb.190...93d&link_type=abstract

Nuclear Physics B, Volume 190, Issue 1, p. 93-112.

Physics

Nuclear Physics

20

Scientific paper

We examine the problem of formulating thermal Green functions for conformally non-invariant field theories in an FRW cosmology. In contrast to the conformally invariant case, the problem is one in non-equilibrium thermodynamics. Our method which involves choosing an appropriate density matrix leads to a version of the imaginary time formalism. The results make contact with elementary relativistic kinetic theory.
Renormalisation is discussed in low order and a running coupling constant dependent on the cosmological scale emerges naturally as an expansion parameter.

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