# $\Lambda$CDM-like models with future singularities

## TL;DR

This paper introduces dark energy models with future singularities, matching current observations but predicting finite-time singularities, and analyzes their effects on matter perturbations.

## Contribution

It presents new phenomenological dark energy models with future singularities and provides exact scalar field representations for various singularity types.

## Key findings

- Models are indistinguishable from cosmological constant up to now
- Established relationship between current equation of state and singularity timing
- Calculated impact on matter perturbation growth

## Abstract

We consider new models of dark energy with finite time future singularities, by introducing the pressure density as a function of the scale factor. This approach gives acceptable phenomenological models of dark energy, practically indistinguishable from the cosmological constant up to the present, which face future singularities at finite time and finite scale factor. Exact scalar field model representation was found for quintessence, Big Rip and type III singularity models. The simple form of the equation of state allows to establish a relationship between its current value, $w_0$, and the time or redshift at which the singularity takes place. The effect on the growth of matter perturbations was calculated.