Viscosity-Induced Crossing of the Phantom Barrier

Abstract

We show explicitly, by using astrophysical data plus reasonable assumptions for the bulk viscosity in the cosmic fluid, how the magnitude of this viscosity may be high enough to drive the fluid from its position in the quintessence region at present time $t=0$ across the barrier $w=-1$ into the phantom region in the late universe. The phantom barrier is accordingly not a sharp mathematical divide, but rather a fuzzy concept. We also calculate the limiting forms of various thermodynamical quantities, including the rate of entropy production, for a dark energy fluid near the future Big Rip singularity.

11 pages, latex, no figures, to appear in Entropy

References in corpus (6)

• Dissipation of dark matter
• Phantom behavior via cosmological creation of particles
• Turbulence and Little Rip Cosmology
• Emergent Universe Scenario via Quintom Matter
• Quasi-Rip: A New Type of Rip Model without Cosmic Doomsday
• Structure formation in a $\Lambda$ $viscous$ CDM universe

Cited by in corpus (17)

• Viscous Cosmology for Early- and Late-Time Universe
• Characteristic Properties of Two Different Viscous Cosmology Models for the Future Universe
• General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the Cosmic Fluid
• Dark Energy Cosmological Models with General forms of Scale Factor
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Non-minimal Derivative Coupling Scalar Field and Bulk Viscous Dark Energy
• Temperature Variation in the Dark Cosmic Fluid in the Late Universe
• Remarks on cosmological bulk viscosity in different epochs
• Black Holes in the Turbulent Phase of Viscous Rip Cosmology
• Can the Hubble tension be resolved by bulk viscosity?
• Anisotropic cosmological models with two fluids
• Study of a viscous $\Lambda$WDM model: Near equilibrium condition, entropy production, and cosmological constraints
• Dissipative Unified Dark Fluid Model
• A non-singular early-time viscous cosmological model
• Thermodynamics of viscous dark energy for the late future time universe
• Phase space analysis of a FRW cosmology in the Maxwell$-$Cattaneo approach
• Viscous effect in the late time evolution of phantom universe