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Parametric Amplification of Metric Fluctuations During Reheating in Two Field Models

We study the parametric amplification of super-Hubble-scale scalar metric fluctuations at the end of inflation in some specific two-field models of inflation, a class of which is motivated by hybrid inflation. We demonstrate that there can indeed be a large growth of fluctuations due to parametric resonance and that this effect is not taken into account by the conventional theory of isocurvature perturbations. Scalar field interactions play a crucial role in this analysis. We discuss the conditions under which there can be nontrivial parametric resonance effects on large scales.

preprint2000arXivOpen access
F. FinelliR. Brandenberger
astro-phhep-phgr-qchep-th
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Open access2 authors4 topics
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F. FinelliR. Brandenberger

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