Viscosity-Induced Crossing of the Phantom Divide in the Dark Cosmic Fluid

Abstract

Choosing various natural forms for the equation-of-state parameter w and the bulk viscosity ζ, we discuss how it is possible for a dark energy fluid to slide from the quintessence region across the divide w=-1 into the phantom region, and thus into a Big Rip future singularity. Different analytic forms for ζ, as powers of the scalar expansion, are suggested and compared with experiments.

11 pages latex, no figures

References in corpus (5)

• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Bulk Viscous Cosmology
• Quasi-Rip: A New Type of Rip Model without Cosmic Doomsday
• Relativistic Viscous Universe Models
• Rip Brane Cosmology from 4d Inhomogeneous Dark Fluid Universe

Cited by in corpus (10)

• 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
• Deformed Matter Bounce with Dark Energy Epoch
• Viscosity-Induced Crossing of the Phantom Barrier
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Remarks on cosmological bulk viscosity in different epochs
• Crossing the phantom divide line in universal extra dimensions
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Thermodynamics of viscous dark energy for the late future time universe
• Dark Energy Density and IS (Israel-Stewart) Bulk Viscosity Model