Pre-inflationary homogenization of scalar field cosmologies

Details Pre-inflationary homogenization of scalar field cosmologies Pre-inflationary homogenization of scalar field cosmologies

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phlb..703..537a&link_type=abstract

Physics Letters B, Volume 703, Issue 5, p. 537-542.

Physics

Cosmology, Early Universe, Inflation, Stability, Perturbations

Scientific paper

We consider the evolution of covariant and gauge invariant linear density perturbations of scalar field cosmologies using a dynamical systems' approach. We find conditions for which the perturbations decay in time, so that the spacetime approaches a homogeneous solution which inflates, for quadratic and exponential potentials. This pre-inflationary homogenization is found to be stable in the potentials' parameter spaces. Furthermore, in each case, we determine the minimum size of the resultant homogeneous patch and show that, for quadratic potentials, the resulting inflationary solutions include those with the necessary number of e-folds.

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