Singularities in any physical theory are either remarkable indicators of the unknown
underlying fundamental theory, or indicate a change in the description of the physical reality …

Abstract The Nobel Prize winning confirmation in 1998 of the accelerated expansion of our
Universe put into sharp focus the need of a consistent theoretical model to explain the origin …

Some cosmological scenarios with bulk viscosity for the dark energy fluid are considered.
Based on some considerations related to hydrodynamics, two different equations of state for …

We investigate the role of bulk and shear viscosity in the spatially homogeneous anisotropic
spacetime, in particular, the Kantowski–Sachs (KS) spacetime. General conditions for the …

In this paper, we explore an extension of the classical non-standard cosmological scenario
in which the new field, ϕ, which interacts with the radiation component in the early universe …

A phantom solution in the framework of the causal Israel–Stewart (IS) formalism is
discussed. We assume a late time behavior of the cosmic evolution by considering only one …

In this paper we present a phantom solution with a big rip singularity in a non-linear regime
of the Israel–Stewart formalism. In this framework it is possible to extend this causal …

Viscous unified dark matter models aim to describe the dark sector of the Universe, as the
dark matter fluid itself gives rise to an accelerated expansion due to a negative bulk viscous …

In this paper we study the consistency of a cosmological model representing a universe
filled with a one-component dissipative dark matter fluid, in the framework of the causal …

This paper is devoted to the phase space analysis of an isotropic and homogeneous model
of the universe by taking a noninteracting mixture of the electromagnetic and viscous …