Unified phantom cosmology: inflation, dark energy and dark matter under the same standard

TL;DR

This paper proposes a unified phantom cosmology model where a single scalar field explains inflation, dark energy, and dark matter, providing a comprehensive framework for the universe's evolution from early to late times.

Contribution

It introduces a novel unified scalar field model that accounts for inflation, dark energy, and dark matter within a single theoretical framework.

Findings

The model can fit observational data effectively.

It naturally addresses the coincidence problem.

The transition from deceleration to acceleration is explained by the same scalar field.

Abstract

Phantom cosmology allows to account for dynamics and matter content of the universe tracing back the evolution to the inflationary epoch, considering the transition to the non-phantom standard cosmology (radiation/matter dominated eras) and recovering the today observed dark energy epoch. We develop the unified phantom cosmology where the same scalar plays the role of early time (phantom) inflaton and late-time Dark Energy. The recent transition from decelerating to accelerating phase is described too by the same scalar field. The (dark) matter may be embedded in this scheme, giving the natural solution of the coincidence problem. It is explained how the proposed unified phantom cosmology can be fitted against the observations which opens the way to define all the important parameters of the model.