Bouncing pre-big bang on the brane

TL;DR

This paper presents a model of a bouncing universe within a brane world scenario, where the universe transitions smoothly from contraction to expansion without violating energy conditions, at low curvature and coupling.

Contribution

It introduces a regular bouncing cosmology in dilaton-gravity brane worlds, achieved through bulk Weyl tensor interactions, avoiding energy condition violations.

Findings

Universe undergoes a smooth bounce from contraction to expansion.

Bounce occurs at low curvature and coupling, ensuring physical plausibility.

Model avoids Null Energy Condition violation during the bounce.

Abstract

A regular bouncing universe is obtained in the context of a dilaton-gravity brane world scenario. The scale factor starts in a contracting inflationary phase both in the Einstein and in the string frame, it then undergoes a bounce (due to interaction with the bulk Weyl tensor), and subsequently enters into a decelerated expanding era. This graceful exit is obtained at low curvature and low coupling, and without violating the Null Energy Condition.