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 …

We investigate in detail the possibility that a single imperfect fluid with bulk viscosity can
replace the need for separate dark matter and dark energy in cosmological models. With …

An entropic-force scenario, ie, entropic cosmology, assumes that the horizon of the Universe
has an entropy and a temperature. In the present paper, in order to examine entropic …

We investigate the agegraphic dark energy models which were recently proposed to explain
the dark energy-dominated universe. For this purpose, we calculate their equation of states …

In this paper, we investigate a cosmological model based on viscous f (R, T) gravity as a
potential alternative to dark energy. This model incorporates bulk viscosity and is analyzed …

We study two types of entropic-force models in a homogeneous, isotropic, spatially flat,
matter-dominated universe. The first type is a Λ (t) type similar to Λ (t) CDM (varying-lambda …

Bulk viscosity is the only viscous influence that can change the background dynamics in a
homogeneous and isotropic universe. In the present work, we analyze the bulk viscous …

We investigate the out-of-equilibrium dynamics of viscous fluids in a spatially flat Friedmann-
Lemaître-Robertson-Walker cosmology using the most general causal and stable viscous …

We test a cosmological model which the only component is a pressureless fluid with a
constant bulk viscosity as an explanation for the present accelerated expansion of the …