Bulk viscous cosmology: unified dark matter

Abstract

The bulk viscosity is introduced to model unified dark matter. The viscous unified model assumes the universe is filled with a single fluid with the bulk viscosity. We review the general framework of the viscous cosmology. The Hubble parameter has a direct connection with the bulk viscosity coefficient. For concrete form of the bulk viscosity, the Hubble parameter which has the scaling relation with the redshift can be obtained. We discuss two viscosity models and the cosmological evolution to which they lead. Using SNe Ia data, the viscosity model can be fitted. We briefly review the fitting method here.

Review in the Advances in Astronomy focus issue on Dark Matter; 11 pages, 1 figure

References in corpus (19)

• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Two new diagnostics of dark energy
• Robust Dark Energy Constraints from Supernovae, Galaxy Clustering, and Three-Year Wilkinson Microwave Anisotropy Probe Observations
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Bulk Viscous Cosmology
• The dark degeneracy: On the number and nature of dark components
• Viscous Ricci Dark Energy
• Can a matter-dominated model with constant bulk viscosity drive the accelerated expansion of the universe?
• Exploring a matter-dominated model with bulk viscosity to drive the accelerated expansion of the Universe
• Friedmann cosmology with bulk viscosity: a concrete model for dark energy
• Modified equation of state, scalar field, and bulk viscosity in Friedmann universe
• $\Lambda \alpha$DM: Observational constraints on unified dark matter with constant speed of sound
• Non-adiabatic dark fluid cosmology
• Affine equation of state from quintessence and k-essence fields
• Constraining the dark fluid
• Dark viscous fluid described by a unified equation of state in cosmology
• Affine parameterization of the dark sector: costraints from WMAP5 and SDSS
• Viscous dark fluid

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