Viscous Accelerating Universe with Non-linear and Logarithmic Equation of State Fluid

Abstract

We describe the accelerated expansion of the late-time universe using a generalized equation of state (EoS) when account is taken of bulk viscosity. We assume a homogeneous and isotropic Friedmann-Robertson-Walker spacetime. Solutions of the gravitational equations for dark energy are obtained in implicit form. Characteristic properties of the Universe evolution in the presence of the viscosity effects are discussed. Finally, the dynamics of the accelerated expansion of the viscous universe is discussed, on the basis of a modified logarithmic-corrected EoS.

12 pages, no figures; to appear in Int. J. of Geometric Methods in Modern Physics

References in corpus (12)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• Viscous Cosmology for Early- and Late-Time Universe
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Cosmological Fluids with Logarithmic Equation of State
• Turbulence and Little Rip Cosmology
• Cardy-Verlinde formula in FRW Universe with inhomogeneous generalized fluid and dynamical entropy bounds near the future singularity
• Quasi-Rip: A New Type of Rip Model without Cosmic Doomsday
• Inhomogeneous viscous dark fluid coupled with dark matter in the FRW universe
• Archimedean-type force in a cosmic dark fluid: I. Exact solutions for the late-time accelerated expansion

Cited by in corpus (5)

• Constraining viscous dark energy equation of state in $f(R,L_m)$ gravity
• Viscous fluid cosmology in symmetric teleparallel gravity
• Cosmological constraints in symmetric teleparallel gravity with bulk viscosity
• Ricci cosmology in light of astronomical data
• Singularity softening and avoidance by the action of thermal radiation in a generalized entropic cosmology