Cosmological constraints on unifying Dark Fluid models

TL;DR

This paper investigates unifying dark fluid models as alternatives to dark matter and dark energy, using observational data and theoretical constraints to derive limits on model parameters and explore scalar field implementations.

Contribution

It provides a comprehensive analysis of observational and theoretical constraints on unifying dark fluid models, including scalar field scenarios, to assess their viability.

Findings

Constraints on dark fluid parameters from supernovae, CMB, and large-scale structure data.

Limits derived from big-bang nucleosynthesis considerations.

Insights into scalar field dark fluid models and their compatibility with observations.

Abstract

In the standard model of cosmology, dark matter and dark energy are presently the two main contributors to the total energy in the Universe. However, these two dark components are still of unknown nature, and many alternative explanations are possible. We consider here the so-called unifying dark fluid models, which replace dark energy and dark matter by a unique dark fluid with specific properties. We will analyze in this context recent observational data from supernovae of type Ia, large scale structures and cosmic microwave background, as well as theoretical results of big-bang nucleosynthesis, in order to derive constraints on the dark fluid parameters. We will also consider constraints from local scales, and conclude with a brief study of a scalar field dark fluid model.