Non-Gaussianities in a two-field generalization of Natural Inflation

Abstract

We describe a two-field model that generalizes Natural Inflation, in which the inflaton is the pseudo-Goldstone boson of an approximate symmetry that is spontaneously broken, and the radial mode is dynamical. We analyze how the dynamics fundamentally depends on the mass of the radial mode and calculate/estimate the non-Gaussianities arising from such a scenario.

arXiv comment47 pages, 7 figures

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• Disentangling mass spectra of multiple fields in cosmological collider
• Heavy Spinning Particles from Signs of Primordial Non-Gaussianities: Beyond the Positivity Bounds
• Warm Quasi-Single Field Inflation
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• On the importance of heavy fields in pseudo-scalar inflation