# Transient cosmic acceleration

## TL;DR

This paper investigates two quintessence models where cosmic acceleration is temporary, proposing that one model aligns with observational data and avoids issues with defining observables in String/M-theory.

## Contribution

It introduces and analyzes two transient acceleration models, highlighting a model that transitions from freezing to thawing regimes and addresses theoretical challenges.

## Key findings

- One model aligns with observational data.
- The model avoids issues with defining observables in String/M-theory.
- Transient acceleration can reconcile data with theoretical constraints.

## Abstract

We explore cosmological consequences of two quintessence models in which the current cosmic acceleration is a transient phenomenon. We argue that one of them (in which the EoS parameter switches from freezing to thawing regimes) may reconcile the slight preference of observational data for freezing potentials with the impossibility of defining observables in String/M-theory due to the existence of a cosmological event horizon in asymptotically de Sitter universes.