Abstract

We elaborate on the nonequilibrium nature of the dynamical inflationary phase transition in the early universe. Introducing a coarse-grained scalar field, we derive its effective equation of motion, and its associated density distribution functional. It is shown that they give the correct one-loop field theoretic results of 〈 φ n ( t)〉. Using a path integral formulation, we evaluate the density distribution functional analytically for all time scales. Nongaussian structure and its implications are discussed. The average tunneling time via quantum fluctuation agrees with Hawking-Moss instanton results.

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