1999/03/31 by Matthew Parry, Richard Easther, Parry, Matthew +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9903550
6 pages, 3 figures, Latex. To appear in the electronic proceedings of the 19th Texas Symposium, Paris
arxiv created 1999/03/31 · arxiv updated 2009/11/30
We consider the interaction between perturbations in the inflaton and in the metric during the preheating phase in simple inflationary models. By numerically integrating the Einstein field equations we are able to gauge the impact of non-linear gravitational effects on preheating for the first time. In the lambda phi4 model we find a large increase in the amplitude of sub-Hubble metric modes, beyond that due to gravitational collapse alone. There is significant mode-mode coupling and the amplification is eventually terminated by back reaction effects. We suggest that such enhancement of inhomogeneity will change the behaviour of the post-inflationary universe.