We propose a multi-natural inflation model in which the single-field inflaton potential consists of two or more sinusoidal potentials that are comparable in size but have different periodicity with a possible non-zero relative phase. The model is versatile enough to realize both large-field and small-field inflation. We show that, in a model with two sinusoidal potentials, the predicted values of the spectral index and tensor-to-scalar ratio lie within the 1. σ region of the Planck data. In particular, there is no lower bound on the decay constants in contrast to the original natural inflation. We also show that, in a certain limit, multi-natural inflation can be approximated by a hilltop quartic inflation model. © 2014 The Authors.
Czerny, M., & Takahashi, F. (2014). Multi-natural inflation. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 733, 241–246. https://doi.org/10.1016/j.physletb.2014.04.039