Perspective on completing natural inflation

TL;DR

This paper discusses the theoretical completion of natural inflation models within heterotic string theory, emphasizing the plausibility of 2-flation as the most viable scenario due to gauge group restrictions.

Contribution

It provides a perspective on inflation paths in N-flation models based on heterotic string theory, highlighting the limitations and favoring 2-flation as the most plausible model.

Findings

String theory constrains the number of gauge groups in inflation models.

2-flation emerges as the most plausible natural inflation completion.

The study links string compactification constraints to inflation model viability.

Abstract

We present a perspective on the inflation paths in 2-, 3-,,, N-flation models based on the ultraviolet completion in heterotic string theory, where a number of grand unification scale axions are used. The number of non-Abelian gauge groups for a natural inflation is restricted in string compactification, and we argue that the most plausible completion of natural inflation from a theory perspective is the 2-flation.