Phantom dark energy as an effect of bulk viscosity

Abstract

In a homogeneous and isotropic universe bulk viscosity is the unique viscous effect capable to modify the background dynamics. Effects like shear viscosity or heat conduction can only change the evolution of the perturbations. The existence of a bulk viscous pressure in a fluid, which in order to obey to the second law of thermodynamics is negative, reduces its effective pressure. We discuss in this study the degeneracy in bulk viscous cosmologies and address the possibility that phantom dark energy cosmology could be caused by the existence of non-equilibrium pressure in any cosmic component. We establish the conditions under which either matter or radiation viscous cosmologies can be mapped into the phantom dark energy scenario with constraints from multiple observational data-sets

10 pages, 2 figures, accepted for publication in PRD

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• Characteristic Properties of Two Different Viscous Cosmology Models for the Future Universe
• A New Approach to Cosmological Bulk Viscosity
• General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the Cosmic Fluid
• Viscous Dark Energy In Bianchi Type V Space-Time
• Viscosity-Induced Crossing of the Phantom Barrier
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Modeling of accelerating Universe with bulk viscous fluid in Bianchi V space-time
• Assessing the impact of bulk and shear viscosities on large scale structure formation
• Thermodynamically allowed phantom cosmology with viscous fluid
• Remarks on cosmological bulk viscosity in different epochs
• Black Holes in the Turbulent Phase of Viscous Rip Cosmology
• Stability analysis and constraints on interacting viscous cosmology
• Viscous Coupled Fluids in Inflationary Cosmology
• Viscous cosmology in $f(T)$ gravity
• Cosmological test on viscous bulk models using Hubble Parameter measurements and type Ia Supernovae data
• Extended $\Lambda$CDM model
• Extended $\Lambda$CDM model and viscous dark energy: A Bayesian analysis
• Dynamics of viscous cosmologies in the full Israel-Stewart formalism
• K-essence and kinetic gravity braiding models in two-field measure theory
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Revealing the non-adiabatic nature of dark energy perturbations from galaxy clustering data
• Holographic representation of the unified early and late universe via a viscous dark fluid
• Bulk viscosity, interaction and the viability of phantom solutions
• Israel-Stewart approach to viscous dissipative extended holographic Ricci dark energy dominated universe
• Thermodynamics of viscous dark energy for the late future time universe
• Probing bulk viscosity in relativistic flows
• Viscous fluid dynamics with decaying vacuum energy density
• Phase space analysis of a FRW cosmology in the Maxwell$-$Cattaneo approach
• Exploring the cosmological degeneracy between decaying dark matter model and viscous $\Lambda$CDM
• Note on bulk viscosity as an alternative to dark energy
• Search for a Dark Matter component