Dieterici gas as a Unified Model for Dark Matter and Dark Energy

TL;DR

This paper explores a unified model using Dieterici gas to explain both dark matter and dark energy, suggesting that changes in the equation of state of a background fluid could account for cosmic acceleration without scalar fields.

Contribution

It proposes a novel unified model based on Dieterici gas that can describe dark matter and dark energy through changes in the fluid's equation of state.

Findings

Dieterici gas can model the transition from dark matter to dark energy.

The model explains cosmic acceleration without scalar fields.

Changes in the equation of state drive the behavior of missing energy density.

Abstract

The dominance of dark energy in the universe has necessitated the introduction of a repulsive gravity source to make q0 negative. The models for dark energy range from a simple lambda-term to quintessence, Chaplygin gas, etc. We look at the possibility of how change of behaviour of missing energy density, from DM to DE, may be determined by the change in the equation of state of a background fluid instead of a form of potential. The question of cosmic acceleration can be discussed within the framework of theories which do not necessarily include scalar fields.