Cosmological bounds on oscillating dark energy models

TL;DR

This paper investigates cosmological constraints on oscillating dark energy models where the dark energy equation of state varies periodically, potentially unifying early inflation and late acceleration, using recent observational data.

Contribution

It provides the first comprehensive observational analysis of oscillating dark energy models, assessing their viability with current cosmological data.

Findings

Constraints on model parameters from supernovae, CMB, and BAO data

Oscillating dark energy models remain consistent with observations

Potential to address the cosmic coincidence problem

Abstract

We study some cosmological constraints on the two phenomenological models of oscillating dark energy. In these scenarios, the equation of state of dark energy varies periodically and may provide a way to unify the early acceleration (inflation) and the late time acceleration of the universe. These models give also an effective way to tackle the so-called cosmic coincidence problem. We examine observational constraints on this class of models from the latest observational data including the \emph{gold} sample of 182 type Ia supernovae, the CMB shift parameter $R$ and the BAO measurements from the Sloan Digital Sky Survey.