A 5D noncompact Kaluza -Klein cosmology in the presence of Null perfect fluid

TL;DR

This paper investigates a 5D noncompact Kaluza-Klein cosmology with a null perfect fluid, explaining early inflation and current acceleration of the universe consistent with observations.

Contribution

It introduces a null perfect fluid in 5D Kaluza-Klein cosmology to model both early inflation and late acceleration in a unified framework.

Findings

Demonstrates early inflationary behavior in the model

Shows current acceleration of the universe

Provides a consistent 5D cosmological scenario

Abstract

For the description of the early inflation, and acceleration expansion of the Universe, compatible with observational data, the 5D noncompact Kaluza--Klein cosmology is investigated. It is proposed that the 5D space is filled with a null perfect fluid, resulting a perfect fluid in 4D universe, plus one along the fifth dimension. By analyzing the reduced field equations for flat FRW model, we show the early inflationary behavior and current acceleration of the universe.