D-braneworld cosmology

TL;DR

This paper explores D-braneworld cosmology, highlighting how the Born-Infeld action leads to early universe acceleration and singularity avoidance, differing significantly from traditional Randall-Sundrum models.

Contribution

It introduces a D-braneworld cosmology framework using the Born-Infeld action, revealing new early universe behaviors not present in Nambu-Goto-based models.

Findings

Universe may undergo rapid acceleration in early stages

Closed universe can avoid initial singularity

Dynamics differ when using the open string metric

Abstract

We discuss D-braneworld cosmology, that is, the brane is described by the Born-Infeld action. Compared with the usual Randall-Sundrum braneworld cosmology where the brane action is the Nambu-Goto one, we can see some drastic changes at the very early universe: (i)universe may experience the rapid accelerating phase (ii)the closed universe may avoid the initial singularity. We also briefly address the dynamics of the cosmology in the open string metric, which might be favorer than the induced metric from the view point of the D-brane.