Bulk Viscous Cosmology

Abstract

We propose a scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid. Using dynamical system methods, a qualitative study of the homogeneous, isotropic background scenario is performed in order to determine the phase space of all possible solutions. The specific model which we investigate shares similarities with a generalized Chaplygin gas in the background but is characterized by non-adiabatic pressure perturbations. This model is tested against supernova type Ia and matter power spectrum data. Different from other unified descriptions of dark matter and dark energy, the matter power spectrum is well behaved, i.e., there are no instabilities or oscillations on small perturbation scales. The model is competitive in comparison with the currently most popular proposals for the description of the cosmological dark sector.

25 pages, 5 figures, comments and references added, accepted for publication in PRD

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Cited by in corpus (102)

• Dynamical systems applied to cosmology: dark energy and modified gravity
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Instability of agegraphic dark energy models
• Entropic cosmology for a generalized black-hole entropy
• Dark goo: Bulk viscosity as an alternative to dark energy
• Viscous dark fluid universe
• 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
• Evolution of a Schwarzschild Black Hole in Phantom-like Chaplygin gas Cosmologies
• Evolution of the universe in entropic cosmologies via different formulations
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• Note on the Evolution of the Gravitational Potential in Rastall Scalar Field Theories
• Dissipation of dark matter
• Constraints on dissipative unified dark matter
• Observational constraints on Rastall's cosmology
• Bulk viscous cosmology with causal transport theory
• Non-adiabatic dark fluid cosmology
• Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant
• Relativistic Fluid Dynamics In and Out of Equilibrium -- Ten Years of Progress in Theory and Numerical Simulations of Nuclear Collisions
• Generalized Holographic Dark Energy Model
• Challenging bulk viscous unified scenarios with cosmological observations
• Non-adiabatic-like accelerated expansion of the late universe in entropic cosmology
• Evolution of density perturbations in decaying vacuum cosmology
• A New Approach to Cosmological Bulk Viscosity
• Viscous cosmology in the Weyl-type $f(Q,T)$ gravity
• Entropic cosmology in a dissipative universe
• Late Decaying Dark Matter, Bulk Viscosity and the Cosmic Acceleration
• Interacting viscous dark fluids
• Matter Power Spectrum for the Generalized Chaplygin Gas Model: The Newtonian Approach
• Phantom evolving wormholes with big rip singularities
• Bulk viscous cosmology: unified dark matter
• Magnetized Bianchi Type $V{I}_0$ Barotropic Massive String Universe with Decaying Vacuum Energy Density $\Lambda$
• Evolution of density perturbations in decaying vacuum cosmology: The case of non-zero perturbations in the cosmological term
• Observational constraints on the equation of state of viscous fluid in $f(R,T)$ gravity
• Note on the thermodynamics and the speed of sound of a scalar field
• Matter power spectrum for the generalized Chaplygin gas model: The relativistic case
• Cosmology from a new non-conservative gravity
• Assessing the impact of bulk and shear viscosities on large scale structure formation
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• Uniqueness of Landau-Lifshitz Energy Frame in Relativistic Dissipative Hydrodynamics
• Viscous cosmology in $f(T)$ gravity
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• Relativistic Causal Hydrodynamics Derived from Boltzmann Equation: a novel reduction theoretical approach
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• Bayesian analysis of bulk viscous matter dominated universe
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• Cosmological consequences of first-order general-relativistic viscous fluid dynamics
• Randall-Sundrum model with $\lambda <0$ and bulk brane viscosity
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• LRS Bianchi I model with bulk viscosity in f(R,T) gravity
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• Van der Waals Universe with Adiabatic Matter Creation
• DM particles: how warm they can be?
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• A PAge-like Unified Dark Fluid Model
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• Vector perturbations in bouncing cosmology
• Israel-Stewart approach to viscous dissipative extended holographic Ricci dark energy dominated universe
• Constraining viscous fluid models in $f(Q)$ gravity with data
• Thermal relics in cosmology with bulk viscosity
• Integrable Cosmological Model with van der Waals Gas and Matter Creation
• General relativistic non-ideal fluid equations for dark matter from a truncated cumulant expansion
• Dynamical analysis of a first order theory of bulk viscosity
• Non-linear interactions in cosmologies with energy exchange
• Degenerate Bogdanov-Takens bifurcations in a bulk viscous cosmology
• On the stability problem in relativistic thermodynamics: implications of the Chapman-Enskog formalism
• Thermodynamics of viscous dark energy for the late future time universe
• Gravitational backreaction in cosmological spacetimes
• Lightening the Dark Matter from its Viscosity and Explanation of EDGES Anomaly
• Viscous Cardassian universe
• Gravitational lenses in the dark Universe
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• Matter Creation Cosmologies and Accelerated Expansion
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• The Dynamics of a Two-Fluid Bianchi Type I Universe
• Extending Israel-Stewart theory: Causal bulk viscosity at large gradients
• Newtonian Approach to the Matter Power Spectrum of the Generalized Chaplygin Gas
• Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid
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• Backreaction from inhomogeneous matter fields during large-scale structure formation
• Curvature in causal BD-type inflationary cosmology
• Extended relativistic non-equilibrium thermostatics of stellar structures with radiation pressure
• Bulk Viscosity and Particle Creation in the Inflationary Cosmology
• A causality analysis of the linearized relativistic Navier-Stokes equations