Small field axion inflation with sub-Planckian decay constant

TL;DR

This paper explores a string theory-based axion inflation model with a sub-Planckian decay constant, resulting in small field inflation, low tensor-to-scalar ratio, and low reheating temperature, offering a viable cosmological scenario.

Contribution

It introduces a novel axion inflation model within type IIB superstring theory featuring a sub-Planckian decay constant, emphasizing its inflationary and reheating properties.

Findings

Achieves small field inflation with a small tensor-to-scalar ratio.

Reheating temperature can be as low as GeV.

Demonstrates viability of sub-Planckian axion decay constants in inflation.

Abstract

We study an axion inflation model recently proposed within the framework of type IIB superstring theory, where we pay a particular attention to a sub-Planckian axion decay constant. Our axion potential can lead to the small field inflation with a small tensor-to-scalar ratio, and a typical reheating temperature can be as low as GeV.