Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvd..38.3146c&link_type=abstract
Physical Review D (Particles and Fields), Volume 38, Issue 10, 15 November 1988, pp.3146-3157
Physics
20
Theory Of Quantized Fields, Kinetic Theory, Particle-Theory And Field-Theory Models Of The Early Universe
Scientific paper
We discuss the evolution in time, from an arbitrary initial state, of the low-momentum modes of an unstable field (i.e., the inflation field) which is coupled to a thermal bath in de Sitter space. For convenience, the thermal bath is modeled as a massless scalar field conformally coupled to a background de Sitter space. We give the exact solution for the Feynman-Vernon influence functional which describes the coupling of the thermal bath to the inflation field, as well as an exact solution to a simple evolution problem in which instability of the inflation field is modeled with a negative mass term, in the manner of Guth and Pi. Coupling to a thermal bath leads, in principle, to viscosity and momentum-space diffusion; these effects are not describable with a conventional Hamiltonian. Viscosity and diffusion govern the approach to thermal equilibrium, and compete with de Sitter-space gravitational expansion.
Bruinsma Robijn
Cornwall John M.
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