Renormalization of nonequilibrium dynamics in FRW cosmology

Authors:
  • JBJurgen Baacke
    Jurgen Baacke
  • KHKatrin Heitmann
    Katrin Heitmann
  • CPCarsten Patzold
    Carsten Patzold
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Abstract
We derive the renormalized nonequilibrium equations of motion for a scalar field and its quantum back reaction in a conformally flat Friedmann-Robertson-Walker universe. We use a fully covariant formalism proposed by us recently for handling numerically and analytically nonequilibrium dynamics in one-loop approximation. The system is assumed to be in a conformal vacuum state initially. We use dimensional regularization; we find that the counter terms can be chosen independent of the initial conditions though the divergent leading order graphs do depend on them.