Inflation in a refined racetrack

TL;DR

This paper refines the racetrack inflation model by incorporating an open string modulus, which dynamically interacts with the inflaton, enabling the construction of a realistic inflationary scenario despite complex potential dynamics.

Contribution

It introduces the open string modulus into the racetrack inflation model and demonstrates how to achieve a realistic inflationary setup with appropriate initial conditions.

Findings

Open string modulus dynamically interacts with the inflaton.

A realistic inflation model can be constructed despite complex potential changes.

The model accounts for the embedding of braneworlds in Calabi-Yau throats.

Abstract

In this note, we refine the racetrack inflation model constructed in arXiv:hep-th/0406230 by including the open string modulus. This modulus encodes the embedding of our braneworld inside some Calabi-Yau throat. We argue that in generic this open string modulus dynamically runs with the inflaton field thanks to its nonlinear coupling. A full analysis becomes difficult because the scalar potential changes progressively during the inflation epoch. Nevertheless, by explicit construction we are still able to build a realistic model through appropriate choices of the initial conditions.