Damped Oscillating Dark Energy: Ideal Fluid and Scalar-Tensor description

TL;DR

This paper explores damped oscillating dark energy models using ideal fluid and scalar-tensor frameworks, deriving physical quantities and demonstrating their mathematical equivalence despite differing physical interpretations.

Contribution

It introduces a detailed analysis of damped oscillating dark energy in both ideal fluid and scalar-tensor formalisms, highlighting their equivalence.

Findings

Physical quantities calculated for both models

Mathematical equivalence shown between fluid and scalar-tensor descriptions

Analysis includes coupled and non-coupled dark energy scenarios

Abstract

In this paper, we study damped oscillating form of dark energy for explaining dynamics of universe. First of all, we consider universe is filled with an ideal fluid which has damped oscillating dark energy in terms of this case we calculate several physical quantities such as Hubble parameter, acceleration parameter, energy density, pressure and others for dark energy, dark energy-matter coupling and non-coupling cases. Secondly, we consider as universe is filled with scalar field instead of an ideal fluid we obtain these physical quantities in terms of scalar potential and kinetic term for the same cases in scalar-tensor formalism. Finally, we show that ideal fluid description and scalar-tensor description of dark energy give mathematically equivalent results for this EoS parameter, even if they haven't same physical meaning.