Late-time acceleration with steep exponential potentials

TL;DR

This paper explores a modified steep exponential potential model that explains late-time cosmic acceleration, retains tracker behavior, and is constrained using diverse observational data.

Contribution

It introduces a simple extension of exponential potentials capable of modeling late-time acceleration while maintaining tracker behavior, with observational constraints applied.

Findings

Model successfully explains late-time acceleration.

Steeper exponential potentials can retain tracker behavior.

Observational data constrains model parameters effectively.

Abstract

In this letter, we study the cosmological dynamics of steeper potential than exponential. Our analysis shows that a simple extension of an exponential potential allows to capture late-time cosmic acceleration and retain the tracker behavior. We also perform statefinder and $Om$ diagnostics to distinguish dark energy models among themselves and with $\Lambda$CDM. In addition, to put the observational constraints on the model parameters, we modify the publicly available CosmoMC code and use an integrated data base of baryon acoustic oscillation, latest Type Ia supernova from Joint Light Curves sample and the local Hubble constant value measured by the Hubble Space Telescope.