Mirage cosmology with an unstable probe D3-brane

TL;DR

This paper investigates how an unstable probe D3-brane with tachyon influences mirage cosmology, particularly its impact on brane inflation and addressing superluminal expansion issues.

Contribution

It introduces the effect of tachyon dynamics into mirage cosmology, providing new insights into brane inflation evolution and stability.

Findings

Tachyon kinetic term affects early brane inflation dynamics.

Tachyon helps cure superluminal expansion in mirage cosmology.

Unstable probe brane dynamics modify cosmological evolution.

Abstract

We consider the mirage cosmology by an unstable probe brane whose action is represented by BDI action with tachyon. We study how the presence of tachyon affects the evolution of the brane inflation. At the early stage of the brane inflation, the tachyon kinetic term can play an important role in curing the superluminal expansion in mirage cosmology.