Brane inflation in tachyonic and non-tachyonic type 0B string theories

TL;DR

This paper investigates brane inflation within tachyonic and non-tachyonic type 0B string theories, revealing different inflation behaviors and the distinct role of tachyonic fields compared to ordinary matter.

Contribution

It provides a comparative analysis of brane inflation in tachyonic and non-tachyonic backgrounds, highlighting the unique effects of tachyonic fields on inflation dynamics.

Findings

Non-tachyonic background exhibits power law inflation similar to type IIB.

Tachyonic background results in less divergent brane inflation.

Tachyonic fields influence inflation differently than ordinary matter.

Abstract

We consider the motion of the brane universe moving in a background bulk space of tachyonic and non-tachyonic type 0B string theory. The effective densities are calculated for both cases and they show different power law behavior. Brane inflation for non-tachyonic type 0B background has the same power law behavior as that for type IIB background. The brane inflation under tachyonic background is less divergent than the one without tachyon. The role of tachyonic field in brane inflation scenario is different from that of the ordinary matter field.