Transient Accelerating Scalar Models with Exponential Potential

TL;DR

This paper analyzes exponential potential scalar dark energy models with transient acceleration, finding they lack proper tracking behavior and are incompatible with standard Big Bang cosmology, even with matter couplings.

Contribution

The study critically evaluates the limitations of exponential potential scalar dark energy models in reproducing realistic cosmic evolution.

Findings

Models exhibit transient acceleration with late-time deceleration.

Scalar dark energy dominates at high redshift ($z \,\gtrsim\ 4$).

Models are incompatible with standard Big Bang cosmology.

Abstract

We study a known class of scalar dark energy models in which the potential is of exponential type and the current accelerating era is transient. We find that, although a decelerating era will return in future, however, when extrapolating the model back to the earlier stages ($z \gtrsim 4$), the scalar dark energy becomes dominant over the matter. So these models do not have the desired tracking behavior, and the predicted transient period of acceleration can not be adopted into the standard scenario of Big Bang cosmology. When couplings between the scalar field and the matter are introduced, the models still has the problem, only the time of deceleration return will be varied. To achieve re-deceleration, one has to turn to alternative models that are consistent with the standard Big Bang scenario.