Dynamical Chaos and the Growth of Cosmological Fluctuations

Details Dynamical Chaos and the Growth of Cosmological Fluctuations Dynamical Chaos and the Growth of Cosmological Fluctuations

2001-08-01

arxiv.org/abs/hep-ph/0108008v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, submitted to Phys. Rev. Lett

Scientific paper

I demonstrate that instability in a system of homogeneous scalar fields leads to the growth of super-Hubble metric perturbations. This generalizes the result that parametric resonance can lead to the growth of cosmological perturbations. Since dynamical chaos is common in multi-field quartically coupled systems, I argue that the evolution of the fields after inflation must be examined to determine whether the amplitude of cosmological metric perturbations is underestimated in the standard inflationary calculations. I illustrate this effect with a simple hybrid inflation model.

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