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Non-Gaussianity from the hybrid potential
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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.
Forward citations
Cited by 3 Pith papers
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STOchastic LAttice Simulation of hybrid inflation
In hybrid inflation, stochastic noise breaks topological defects into sub-Hubble-scale structures, and only the n=1 case leaves a global imprint on the curvature perturbation.
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Testing inflation on all scales: a case study with $\alpha$-attractors
A subset of hybrid alpha-attractor inflation models passes all large- and small-scale constraints and predicts scalar-induced gravitational waves detectable by LISA.
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Origin of ultra-light fields during inflation and their suppressed non-Gaussianity
A scaling symmetry in a class of two-field inflation models naturally produces a massless isocurvature field whose self-interactions are suppressed, making primordial non-Gaussianity slow-roll suppressed but with a sq...
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