Cosmological Aspects of Rolling Tachyon

TL;DR

This paper explores the potential of rolling tachyons to serve as both inflatons and dark matter, analyzing inflation generation mechanisms and highlighting reheating challenges.

Contribution

It introduces a model where rolling tachyons can drive early universe inflation and later act as dark matter, addressing inflation mechanisms and reheating issues.

Findings

Inflation can be achieved via large brane numbers or brane world effects.

Reheating remains a significant challenge in the model.

The model links tachyon dynamics to both inflation and dark matter roles.

Abstract

We examine the possibility of rolling tachyon to play the dual roll of inflaton at early epochs and dark matter at late times. We argue that enough inflation can be generated with the rolling tachyon either by invoking the large number of branes or brane world assisted inflation. However, reheating is problematic in this model.