Gauss-Bonnet braneworld redux: A novel scenario for the bouncing universe

TL;DR

This paper introduces a new bouncing universe scenario within a five-dimensional braneworld model using Einstein-Gauss-Bonnet gravity, where a brane passes through a branch singularity, enabling a transition from collapse to expansion.

Contribution

It demonstrates that a brane can pass through a branch singularity in a higher-curvature gravity model, enabling a novel bouncing universe mechanism.

Findings

The brane can reach and pass through the branch singularity.

The bulk spacetime extends beyond the singularity as a thin shell.

This process results in a transition from collapse to expansion.

Abstract

We propose a new scenario for the bouncing universe in a simple five-dimensional braneworld model in the framework of Einstein-Gauss-Bonnet gravity, which works even with ordinary matter on the brane. In this scenario, the so-called branch singularity located at a finite physical radius in the bulk spacetime plays an essential role. We show that a three-brane moving in the bulk may reach and pass through it in spite of the fact that it is a curvature singularity. The bulk spacetime is extended beyond the branch singularity in the C^0 sense and then the branch singularity is identified as a massive thin shell. From the bulk point of view, this process is the collision of the three-brane with the shell of branch singularity. From the point of view on the brane, this process is a sudden transition from the collapsing phase to the expanding phase of the universe. The present result opens a completely new possibility to achieve the bouncing brane universe as a higher-curvature effect.