Dark Energy Coupled with Dark Matter in Viscous Fluid Cosmology

Abstract

We investigate cosmological models with two interacting fluids: dark energy and dark matter in flat Friedmann-Robertson-Walker universe. The interaction between dark energy and dark matter is described in terms of the parameters present in the inhomogeneous equation of state when allowance is made for bulk viscosity, for the Little Rip, the Pseudo Rip, and the bounce universes. We obtain analytic representation for characteristic properties in these cosmological models, in particular the bulk viscosity $\zeta =\zeta (H,t)$ as function of Hubble parameter and time. We discuss the corrections of thermodynamical parameters in the equations of state due coupling between the viscous fluid and dark matter. Some common properties of these corrections are elucidated.

6 pages, no figures; to appear in Astrophys. Space Science

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• Remarks on cosmological bulk viscosity in different epochs
• Dissipative Universe-Inflation with Soft Singularity
• The unified history of the viscous accelerating universe and phase transitions
• Gravitational Waves in the Presence of Viscosity
• Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds
• Holographic cosmology with two coupled fluids in the presence of viscosity
• Probing Lambda-DGP Braneworld Model
• The Holographic cosmology with axion field
• Observational constraints in late time for an axially symmetric transitioning model with bulk viscous fluid
• Holographic bounce cosmological models induced by viscous dark fluid from a generalized non-singular entropy function
• Scalar field unification of interacting viscous dark fluid from a geometrical scalar-tensor theory of gravity
• Note on bulk viscosity as an alternative to dark energy
• Ricci cosmology in light of astronomical data
• Asymptotic evolution of bulk-viscous, spherically symmetric spacetimes