Scalar Perturbations in a String Inspired Inflationary Scenario

TL;DR

This paper explores a string-inspired inflationary model where the universe expands exponentially, analyzing scalar perturbations and identifying a mode with exponential growth in scalar field perturbations.

Contribution

It introduces a string-inspired inflationary scenario and studies its scalar perturbations, revealing a mode with exponential growth not previously characterized.

Findings

Identification of an exponentially growing scalar perturbation mode

Insights into the stability of string-inspired inflationary models

Potential implications for early universe cosmology

Abstract

We consider an inflationary model inspired in the low energy limit of string theory. In this model, the scale factor grows exponentially with time. A perturbation study is performed, and we show that there is a mode which displays an exponential growth in the perturbation of the scalar field.