X-fluid and viscous fluid in D-dimensional anisotropic integrable cosmology

TL;DR

This paper investigates a D-dimensional cosmological model with an x-fluid and viscous fluid in Ricci-flat spaces, providing exact solutions that suggest a potential resolution to the cosmic coincidence problem by modeling dark energy and dark matter.

Contribution

It introduces exact solutions in anisotropic cosmology with viscous and x-fluid components, exploring their role in addressing dark energy and dark matter coincidence.

Findings

Exact solutions for anisotropic cosmology with viscous and x-fluid components.

Demonstrates the potential to resolve the cosmic coincidence problem.

Shows the role of viscous fluids as dark matter in the model.

Abstract

D-dimensional cosmological model describing the evolution of a perfect fluid with negative pressure (x-fluid) and a fluid possessing both shear and bulk viscosity in n Ricci-flat spaces is investigated. The second equations of state are chosen in some special form of metric dependence of the shear and bulk viscosity coefficients. The equations of motion are integrated and the dynamical properties of the exact solutions are studied. It is shown the possibility to resolve the cosmic coincidence problem when the x-fluid plays role of quintessence and the viscous fluid is used as cold dark matter.