Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-03-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 3 figures, Latex. To appear in the electronic proceedings of the 19th Texas Symposium, Paris
Scientific paper
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 phi^4 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.
Easther Richard
Parry Matthew
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