Phys. Rev. D 56, 6556–6565 (1997)Renormalization of nonequilibrium dynamics in FRW cosmologyReceived 10 June 1997; published in the issue dated 15 November 1997 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 the one-loop approximation. The system is assumed to be in a conformal vacuum state initially. We use dimensional regularization; we find that the counterterms can be chosen independent of the initial conditions though the divergent leading order graphs do depend on them. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.56.6556
DOI:
10.1103/PhysRevD.56.6556
PACS:
11.15.Kc, 11.10.Gh, 11.10.Wx, 98.80.Cq
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