Bouncing and Colliding Branes

TL;DR

This paper explores the dynamics of moving branes in braneworld cosmology, including bouncing off singularities and colliding scenarios, with implications for early universe models.

Contribution

It introduces new insights into brane motion near singularities and reviews a colliding branes solution in heterotic M-theory as a cosmological model.

Findings

Negative-tension branes can bounce off spacetime singularities.

Colliding branes solutions can model early universe cosmology.

Implications for cosmological perturbations are discussed.

Abstract

In a braneworld description of our universe, we must allow for the possibility of having dynamical branes around the time of the big bang. Some properties of such domain walls in motion are discussed here, for example the ability of negative-tension domain walls to bounce off spacetime singularities and the consequences for cosmological perturbations. In this context, we will also review a colliding branes solution of heterotic M-theory that has been proposed as a model for early universe cosmology.