Coupled scalar fields in a flat FRW universe: renormalisation
Abstract
We study the non-equilibrium dynamics of a system of coupled scalar fields in a Friedmann-Robertson-Walker (FRW) universe. We consider the evolution of spatially homogeneous "classical" fields and of their quantum fluctuations including the quantum backreaction in the one-loop approximation. We discuss in particular the dimensional regularisation of the coupled system and a special subtraction procedure in order to obtain the renormalised equations of motion and the renormalised energy-momentum tensor and ensure that the energy is well-defined and covariantly conserved. These results represent at the same time a theoretical analysis and a viable scheme for stable numerical simulations. As an example for an application of the general formalism, we present simulations for a hybrid inflationary model.
Cite
@article{arxiv.1006.2376,
title = {Coupled scalar fields in a flat FRW universe: renormalisation},
author = {Jurgen Baacke and Laura Covi and Nina Kevlishvili},
journal= {arXiv preprint arXiv:1006.2376},
year = {2014}
}
Comments
41 pages, 6 figures, LateX