Constraints on generating the primordial curvature perturbation and non-Gaussianity from instant preheating

Abstract

We analyse models of inflation in which isocurvature perturbations present during inflation are converted into the primordial curvature perturbation during instant preheating. This can be due to an asymmetry between the fields present either during inflation or during preheating. We consider all the constraints that the model must satisfy in order to be theoretically valid and to satisfy observations. We show that the constraints are very tight in all of the models proposed and special initial conditions are required for the models to work. In the case where the symmetry is strongly broken during inflation the non-Gaussianity parameter f_NL is generally large and negative.

13 pages, 2 figures, v2: notation clarified, Refs added, typo in (21) corrected, matches version accepted for publication in JCAP

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• The stochastic spectator
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• Preheating and the non-gaussianity of the curvature perturbation
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• Nongaussianity from Particle Production During Inflation
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• Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
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• Beauty is Distractive: Particle production during multifield inflation
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• On Non-Gaussianities in Two-Field Poly-Instanton Inflation
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• Instant preheating in a scale invariant two measures theory
• What Planck does not tell us about inflation
• Particle Production during Inflation in Light of PLANCK
• Affleck-Dine baryogenesis with modulated reheating
• Deriving super-horizon curvature perturbations from the dynamics of preheating