Interacting viscous dark fluids

Abstract

We revise the conditions for the physical viability of a cosmological model in which dark matter has bulk viscosity and also interacts with dark energy. We have also included radiation and baryonic matter components; all matter components are represented by perfect fluids, except the dark matter, that is treated as an imperfect fluid. We impose upon the model the condition of a complete cosmological dynamics that results in an either null or negative bulk viscosity, but the latter also disagrees with the Local Second Law of Thermodynamics. The model is also compared with cosmological observations at different redshifts: type Ia supernova, the shift parameter of CMB, the acoustic peak of BAO, and the Hubble parameter H(z). In general, observations consistently point out to a negative value of the bulk viscous coefficient, and in overall the fitting procedure shows no preference for the model over the standard LCDM model.

16 pages, 11 figures, 5 tables

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• Phase Space Analysis of the Accelerating Multi-fluid Universe
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• Accelerated and decelerated expansion in a causal dissipative cosmology
• Some remarks about non-minimally coupled scalar field models
• Late-Time Viscous Cosmology in $f(R,T)$ Gravity
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Constraints and cosmography of $\Lambda$CDM in presence of viscosity
• Analysing dissipative effects in the $\Lambda$CDM model
• Phantom solution in a non-linear Israel-Stewart theory
• Stability analysis and constraints on interacting viscous cosmology
• Extended $\Lambda$CDM model and viscous dark energy: A Bayesian analysis
• Dynamics of viscous cosmologies in the full Israel-Stewart formalism
• Cosmic expansion with matter creation and bulk viscosity
• Constraining a causal dissipative cosmological model
• Revisiting perfect fluid dark matter: Observational constraints from our galaxy
• Global dynamics in Einstein-Gauss-Bonnet scalar field cosmology with matter
• Interacting phantom dark energy: new accelerating scaling attractors
• Viscous extended holographic Ricci dark energy in the framework of standard Eckart theory
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Higher Order Lagrangians inspired by the Pais-Uhlenbeck Oscillator and their cosmological applications
• Bulk viscosity, interaction and the viability of phantom solutions
• Qualitative analysis for viscous cosmologies in a non linear regime of the Israel-Stewart formalism
• Thermodynamics of viscous dark energy for the late future time universe
• WIMP dark matter in bulk viscous non-standard cosmologies
• FIMP Dark Matter in bulk viscous non-standard cosmologies
• Phase space analysis of a FRW cosmology in the Maxwell$-$Cattaneo approach
• Phase space of multi-fluid universe in $F(T)$-gravity and some enhancements for the oscillating interaction model
• Late time attractors of some varying Chaplygin gas cosmological models