Parametric amplification of metric fluctuations during reheating in two field models

By F. Finelli, Robert Brandenberger. 2000

143 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1d537fb3e2e5088409234c5cc7cdea4b81ac841f

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Citations in the corpus

Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory (2008, background): “Such singularities are known from the study of the evolution of Φ during reheating taking into account the oscillatory nature of the inflaton field [48, 49].”
On the Spectrum of Fluctuations in an Effective Field Theory of the Ekpyrotic Universe (2001, background): “[19]) and in the case of the growth of fluctuations on superHubble scales during the reheating period of inflationary cosmology [35,36] (such growth does not occur in single field models [36,37], but it does occur in the case of the existence of unsuppressed entropic fluctuations [38,39]).”