Preheating, parametric resonance and the Einstein field equations
Abstract
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 nonlinear gravitational effects on preheating for the first time. In the lambda phi^4 model we find a large increase in the amplitude of subHubble metric modes, beyond that due to gravitational collapse alone. There is significant modemode coupling and the amplification is eventually terminated by back reaction effects. We suggest that such enhancement of inhomogeneity will change the behaviour of the postinflationary universe.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 January 2000
 DOI:
 10.48550/arXiv.hepph/9903550
 arXiv:
 arXiv:hepph/9903550
 Bibcode:
 2000NuPhS..80C0418P
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 6 pages, 3 figures, Latex. To appear in the electronic proceedings of the 19th Texas Symposium, Paris