On the Big Bounce Singularity of a Simple 5D Cosmological Model

TL;DR

This paper investigates a 5D cosmological model where the big bounce replaces the big bang singularity, showing it is an event horizon with finite scale factor and density, and revealing the universe's infinite past contraction.

Contribution

It demonstrates that in a 5D model, the big bounce acts as an event horizon with finite physical quantities, contrasting with traditional singularities.

Findings

The big bounce is an event horizon with finite scale factor and density.

The pressure transitions from negative to positive infinity at the bounce.

The universe has existed for an infinite duration before the bounce.

Abstract

The big bounce singularity of a simple 5D cosmological model is studied. Contrary to the standard big bang space-time singularity, this big bounce singularity is found to be an event horizon at which the scale factor and the mass density of the universe are finite, while the pressure undergoes a sudden transition from negative infinity to positive infinity. By using coordinate transformation it is also shown that before the bounce the universe contracts deflationary, and the universe has been existed, according to the proper-time, for an infinitely long time.