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

TL;DR

This paper explores a two-field inflation model extending Natural Inflation, focusing on how the radial mode's mass influences the dynamics and the resulting non-Gaussianities in the primordial fluctuations.

Contribution

It introduces a novel two-field generalization of Natural Inflation including a dynamical radial mode and analyzes its impact on non-Gaussianities.

Findings

Radial mode mass significantly affects inflation dynamics.

Non-Gaussianities are estimated within this model.

The model provides new insights into multi-field inflation scenarios.

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.