# Bulk Viscosity Effects on the Early Universe Stability

@article{Carlevaro2005BulkVE, title={Bulk Viscosity Effects on the Early Universe Stability}, author={Nakia Carlevaro and Giovanni Montani}, journal={Modern Physics Letters A}, year={2005}, volume={20}, pages={1729-1739} }

We present a discussion of the effects induced by the bulk viscosity on the very early Universe stability. The matter filling the cosmological (isotropic and homogeneous) background is described by a viscous fluid having an ultrarelativistic equation of state and whose viscosity coefficient is related to the energy density via a power-law of the form ζ = ζ0 ρν. The analytic expression of the density contrast (obtained for ν = 1/2) shows that, for small values of the constant ζ0, its behavior is…

## 14 Citations

On the Role of Viscosity in Early Cosmology

- Physics
- 2008

We present a discussion of the effects induced by bulk viscosity on the very early Universe stability. The viscosity coefficient is assumed to be related to the energy density ρ via a power-law of…

Bianchi I cosmology in the presence of a causally regularized viscous fluid

- Physics
- 2016

We analyze the dynamics of a Bianchi I cosmology in the presence of a viscous fluid, causally regularized according to the Lichnerowicz approach. We show how the effect induced by shear viscosity is…

INFLUENCE OF MATTER CREATION ON THE EARLY UNIVERSE STABILITY

- Physics
- 2008

The effects of the particles creation processes on the evolution of a spatially flat Friedmann–Lemaitre–Robertson–Walker (FLRW) universe are investigated. Our approach is involved in the context of…

The Jeans Instability in Presence of Viscous Effects

- Physics
- 2009

An analysis of the gravitational instability in presence of dissipative effects is addressed. In particular, the standard Jeans Mechanism and the generalization in treating the Universe expansion are…

Phase transition of cosmological model with statistical techniques

- Physics
- 2020

In the present communication, we investigated flat Friedmann-Lemaitre-Robertson-Walker mathematical model of universe in
$f (R,T )$
theory of gravity with bulk viscous fluid as a source of energy.…

Topology of the second-order constitutive model based on the Boltzmann–Curtiss kinetic equation for diatomic and polyatomic gases

- Physics
- 2020

The topological aspects of fluid flows have long been fascinating subjects in the study of the physics of fluids. In this study, the topology of the second-order Boltzmann–Curtiss constitutive model…

Impact of bulk viscosity on flow morphology of shock-accelerated cylindrical light bubble in diatomic and polyatomic gases

- PhysicsPhysics of Fluids
- 2021

Shock-accelerated bubbles have long been an intriguing topic for understanding the fundamental physics of turbulence generation and mixing caused by the Richtmyer–Meshkov instability. In this study,…

Non-equilibrium effects of diatomic and polyatomic gases on the shock-vortex interaction based on the second-order constitutive model of the Boltzmann-Curtiss equation

- Physics
- 2018

The rotational mode of molecules plays a critical role in the behavior of diatomic and polyatomic gases away from equilibrium. In order to investigate the essence of the non-equilibrium effects, the…

## References

SHOWING 1-9 OF 9 REFERENCES

Influence of particle creation on flat and negative curved FLRW universes

- Economics
- 2001

We present a dynamical analysis of (classical) spatially flat and negative curved Friedmann-Lameitre-Robertson-Walker (FLRW) universes evolving (by assumption) close to the thermodynamic equilibrium…

Investigations in relativistic cosmology

- Physics
- 1963

Abstract (by translator) A detailed report is given here of the general investigations carried out by the authors in the field of relativistic cosmology during the past years. The paper consists of…

Frame independence of the inhomogeneous mixmaster chaos via Misner-Chitre-like variables

- Mathematics
- 2004

We outline the covariant nature, with respect to the choice of a reference frame, of the chaos characterizing the generic cosmological solution near the initial singularity, i.e., the so-called…

The Thermodynamics of Irreversible Processes. III. Relativistic Theory of the Simple Fluid

- Physics
- 1940

The considerations of the first paper of this series are modified so as to be consistent with the special theory of relativity. It is shown that the inertia of energy does not obviate the necessity…

Big-Bang Model Without Singularities

- Physics
- 1973

A uniform cosmological model filled with fluid which possesses pressure and second viscosity is developed. The Einstein equations can be integrated exactly. One solution is the steady-state…

Qualitative analysis of dissipative cosmologies

- Physics
- 2000

The evolution of an homogeneous and isotropic dissipative fluid is analyzed using dynamical systems techniques. The dissipation is driven by bulk viscous pressure and the truncated Israel-Stewart…

The classical theory of fields

- Physics, Geology
- 1952

The principle of relativity Relativistic mechanics Electromagnetic fields Electromagnetic waves The propagation of light The field of moving charges Radiation of electromagnetic waves Particle in a…