New futures for cosmological models

TL;DR

This paper reviews new potential futures for the universe's evolution, including singular and non-singular scenarios, based on generalized mathematical expansions of the universe's scale factor.

Contribution

It introduces a comprehensive analysis of novel cosmological fates using generalized power and asymptotic expansions, expanding understanding of possible universe evolutions.

Findings

Identification of new singular and non-singular cosmic evolutions

Analysis of the extendibility of spacetime beyond certain singularities

Use of generalized mathematical expansions to classify universe futures

Abstract

The discovery of accelerated expansion of the universe opened the possibility of new scenarios for the doom of our spacetime, besides aeternal expansion and a final contraction. In this paper we review the chances which may await our universe. In particular, there are new possible singular fates (sudden singularities, big rip...), but there also other evolutions which cannot be considered as singular. In addition to this, some of the singular fates are not strong enough in the sense that the spacetime can be extended beyond the singularity. For deriving our results we make use of generalised power and asymptotic expansions of the scale factor of the universe.