2001/08/01 by J. P. Zibin, Zibin, J. P.
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Chaotic Dynamics (nlin.CD) #Cosmology and Gravitation Theories #FOS: Physical sciences #Geophysics and Gravity Measurements #High Energy Physics - Phenomenology (hep-ph) #Solar and Space Plasma Dynamics #astro-ph #hep-ph #nlin.CD
paper · pdf · doi:10.48550/arxiv.hep-ph/0108008
4 pages, 2 figures, submitted to Phys. Rev. Lett
arxiv created 2001/08/01 · openalex publication_date 2001/08/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.