Non-Gaussianity from the hybrid potential

Abstract

We study the hybrid inflationary potential in a regime where the defect field is light, and more than 60 e-folds of accelerated expansion occur after the symmetry breaking transition. Using analytic and numerical techniques, we then identify parameter values within this regime for which the statistics of the primordial curvature perturbation are significantly non-Gaussian. Focusing on this range of parameters, we provide a specific example which leads to an observationally consistent power spectrum, and a level of non-Gaussianity within current WMAP bounds and in reach of the Planck satellite. An interesting feature of this example is that the initial conditions at horizon crossing appear quite natural.

9 pages, 7 figures

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Cited by in corpus (35)

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• Can massive primordial black holes be produced in mild waterfall hybrid inflation?
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• Landscape tomography through primordial non-Gaussianity
• Testing Inflation and Curvaton Scenarios with CMB Distortions
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• Primordial curvature perturbation during and at the end of multi-field inflation
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• Stochastic-tail of the curvature perturbation in hybrid inflation
• Observable predictions of generalised inflationary scenarios
• Cosmological Perturbations from Hybrid Potentials