Preheating curvature perturbations with a coupled curvaton

Abstract

We discuss the potentially important role played by preheating in certain variants of the curvaton mechanism in which isocurvature perturbations of a D-flat (and F-flat) direction become converted to curvature perturbations during reheating. We analyse the transition from inflation to reheating in some detail, including the dynamics of the coupled curvaton and inflation fields during this transition. We discover that preheating could be an important source of adiabaticity where parametric resonance of the isocurvature components amplifies the super-horizon fluctuations by a significant amount. As an example of these effects we develop a particle physics motivated model which we recently introduced in which the D-flat direction is identified with the usual Higgs field. Our new results show that it is possible to achieve the correct curvature perturbations for initial values of the curvaton fields of order the weak scale. In this model we show that the prediction for the spectral index of the final curvature perturbation only depends on the mass of the curvaton during inflation, where consistency with current observational data requires the ratio of this mass to the Hubble constant to be < 0.3.

32 pages, 8 figures

References in corpus (13)

• Conserved cosmological perturbations
• The Curvaton as a Pseudo-Nambu-Goldstone Boson
• Curvaton Dynamics
• MSSM flat direction as a curvaton
• The CDM isocurvature perturbation in the curvaton scenario
• The Peccei-Quinn Field as Curvaton
• Resonant decay of flat directions
• Cosmic String from D-term Inflation and Curvaton
• MSSM curvaton in the gauge-mediated SUSY breaking
• Curvatons in Supersymmetric Models
• Supersymmetric Curvatons and Phase-Induced Curvaton Fluctuations
• Constraining the curvaton scenario
• Spectral Index of Curvaton Perturbations in Flat Potential Inflation Models

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