Density preturbations in a finite scale factor singularity universe

TL;DR

This paper investigates how density perturbations evolve in cosmological models with finite scale factor singularities, showing certain parameters can mimic standard LCDM behavior despite future singularities.

Contribution

It introduces a class of models with finite scale factor singularities that replicate LCDM matter evolution, expanding understanding of alternative cosmologies.

Findings

Existence of parameter sets leading to finite scale factor singularities.

Models can reproduce standard LCDM matter evolution.

Some models are indistinguishable from LCDM observationally.

Abstract

We discuss evolution of density perturbations in cosmological models which admit finite scale factor singularities. After solving the matter perturbations equations we find that there exists a set of the parameters which admit a finite scale factor singularity in future and instantaneously recover matter density evolution history which are indistinguishable from the standard LCDM scenario.