TL;DR
This paper explores a unified dark fluid model with bulk viscosity, where the viscosity depends on the Hubble parameter, aiming to match observational data from recombination to the present.
Contribution
It introduces a dark fluid model with a bulk viscosity coefficient as a function of the Hubble parameter, fitting observational data across cosmic history.
Findings
The model can reproduce observational data from recombination to today.
The viscosity function is chosen to satisfy cosmological constraints.
The approach unifies dark matter and dark energy within a viscous fluid framework.
Abstract
The unified dark energy and dark matter model within the framework of a model of a continuous medium with bulk viscosity (dark fluid) is considered. It is supposed that the bulk viscosity coefficient is an arbitrary function of the Hubble parameter. The choice of this function is carried out under the requirement to satisfy the observational data from recombination () till present time.
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