Hybrid Natural Low Scale Inflation

Abstract

We discuss the phenomenological implications of hybrid natural inflation models in which the inflaton is a pseudo-Goldstone boson but inflation is terminated by a second scalar field. A feature of the scheme is that the scale of breaking of the Goldstone symmetry can be lower than the Planck scale and so gravitational corrections are under control. We show that, for supersymmetric models, the scale of inflation can be chosen anywhere between the Lyth upper bound and a value close to the electroweak breaking scale. Unlike previous models of low scale inflation the observed density perturbations and spectral index are readily obtained by the choice of the free parameters.

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• Complex Scalar Field Reheating and Primordial Black Hole production
• Superheavy dark matter from the natural inflation in light of the highest-energy astroparticle events
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• CMB Spectral $\mu$-Distortion of Multiple Inflation Scenario
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• General bounds in Hybrid Natural Inflation
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• Hybrid inflation and gravitational waves from accidentally light scalars
• Generalized hybrid natural inflation
• Bounds for the scale of inflation and the tensor-to-scalar ratio in Hybrid Natural Inflation