Viscous effect in the late time evolution of phantom universe

Abstract

We investigate the cosmological implications of a phantom dark energy model with bulk viscosity. We explore this model as a possible way to resolve the big rip singularity problem that plagues the phantom models. We use the latest type Ia supernova and Hubble parameter data to constrain the model parameters and find that the data favor a significant bulk viscosity over a non-constant potential term for the phantom field. We perform a dynamical analysis of the model and show that the only stable and physical attractor corresponds to a phantom-dominated era with a total equation of state that can be greater than $-1$ due to the viscosity. We also study the general effect of viscosity on the phantom field and the late time evolution of the universe. We apply the statefinder diagnostic to the model and find that it approaches a nearby fixed point asymptotically, indicating that the universe can escape the big rip singularity with the presence of bulk viscosity. We conclude that bulk viscosity can play an important role in affecting the late-time behavior as well as alleviating the singularity problem of the phantom universe.

accepted by EPJC

References in corpus (13)

• The future evolution and finite-time singularities in $F(R)$-gravity unifying the inflation and cosmic acceleration
• Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
• Viscous Cosmology for Early- and Late-Time Universe
• Cosmology and Astrophysical Constraints of Gauss-Bonnet Dark Energy
• Interacting Holographic Phantom
• Interacting Agegraphic Dark Energy
• Avoidance of future singularities in loop quantum cosmology
• Cosmological Evolution of Interacting Phantom Energy with Dark Matter
• Interacting Phantom Energy
• Dynamics of interacting phantom scalar field dark energy in Loop Quantum Cosmology
• Viscous cosmology in $f(T)$ gravity
• Phantom Instability of Viscous Dark Energy in Anisotropic Space-Time
• Latest data constraint of some parameterized dark energy models