Oscillating Universe from inhomogeneous EoS and coupled dark energy

TL;DR

This paper proposes a model of an oscillating universe driven by inhomogeneous dark energy and coupled dark energy-matter interactions, unifying early and late acceleration phases and exploring future singularities.

Contribution

It introduces a novel oscillating universe model using inhomogeneous EoS and dark energy-matter coupling, with scalar-tensor equivalence and analysis of singularities.

Findings

Universe exhibits periodic expansion and contraction cycles.

Dark energy-matter coupling induces oscillations in cosmic evolution.

Possible phantom phases and future singularities are identified.

Abstract

An occurrence of an oscillating Universe is showed using an inhomogeneous equation of state for dark energy fluid. The Hubble parameter described presents a periodic behavior such that early and late time acceleration are unified under the same mechanism. Also, it is considered a coupling between dark energy fluid, with homogeneous and constant EoS, and matter, that gives a periodic Universe too. The possible phantom phases and future singularities are studied in the oscillating Universe under discussion. The equivalent scalar-tensor representation for the same oscillating Universe is presented too.