Suppressing Super-Horizon Curvature Perturbations?

Abstract

We consider the possibility of suppressing superhorizon curvature perturbations after the end of the ordinary slow-roll inflationary stage. This is the opposite of the curvaton limit. We assume that large curvature perturbations are created by the inflaton and investigate if they can be diluted or suppressed by a second very homogeneous field which starts to dominate the energy density of the universe shortly after the end of inflation. We show explicit that the gravitational sourcing of inhomogeneities from the more inhomogeneous fluid to the more homogeneous fluid makes the suppression difficult if not impossible to achieve.

10 pages, 1 figure. Important revision. Conclusions more negative

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• Non-Gaussianity, Isocurvature Perturbation, Gravitational Waves and a No-Go Theorem for Isocurvaton
• Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio
• Chaotic inflation with curvaton induced running
• Temporal enhancement of super-horizon curvature perturbations from decays of two curvatons and its cosmological consequences
• Low Scale Inflation at High Energy Colliders and Meson Factories
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Modulation of the waterfall by a gauge field
• Reconstruction of the isocurvaton scenario