# Open string tachyon is the stringy inflaton

## TL;DR

This paper proposes that open string tachyon condensation can serve as a stringy inflaton, potentially filling a gap in string theory's early universe cosmology models.

## Contribution

It demonstrates that open string tachyon condensation is equivalent to a form of stringy inflation, offering a new approach to incorporate inflation into superstring theory.

## Key findings

- Open string tachyon acts as a stringy inflaton.
- Tachyon condensation can drive inflation in string theory.
- Addresses the lack of early universe cosmology in superstring theory.

## Abstract

Regarding the current status of the superstring theory, despite its fully developed contents of all interactions in nature, it is no doubt that unfortunately it lacks a well established early universe cosmology content, that is, the inflationary universe. In the present work, we would like to address precisely this issue. To be more concrete, we would like to demonstrate that remarkably it is the well established open string tachyon condensation which is essentially equivalent to the stringy inflation that has been missing and hence long-seeking by nearly the entire string community.