Study of the Quasi-isotropic Solution near the Cosmological Singularity in Presence of Bulk-Viscosity

@article{Carlevaro2007StudyOT,
  title={Study of the Quasi-isotropic Solution near the Cosmological Singularity in Presence of Bulk-Viscosity},
  author={Nakia Carlevaro and Giovanni Montani},
  journal={arXiv: General Relativity and Quantum Cosmology},
  year={2007}
}
We analyze the dynamical behavior of a quasi-isotropic Universe in the presence of a cosmological fluid endowed with bulk viscosity. We express the viscosity coefficient as a power-law of the fluid energy density: $\zeta=\zeta_0\epsilon^{s}$. Then we fix $s=1/2$ as the only case in which viscosity plays a significant role in the singularity physics but does not dominate the Universe dynamics (as requested by its microscopic perturbative origin). The parameter $\zeta_0$ is left free to define… 

The Jeans Instability in Presence of Viscous Effects

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

EARLY COSMOLOGY AND FUNDAMENTAL GENERAL RELATIVITY

  • Physics
  • 2007

References

SHOWING 1-10 OF 51 REFERENCES

Bulk Viscosity Effects on the Early Universe Stability

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

On the quasi-isotropic solution in the presence of ultrarelativistic matter and a scalar field

In this paper we analyse, in the asymptotic limit to the cosmological singularity, the quasi-isotropic universe dynamics in the presence of ultrarelativistic matter and a real self-interacting scalar

Investigations in relativistic cosmology

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

Influence of particle creation on flat and negative curved FLRW universes

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

Comment about quasi-isotropic solution of Einstein equations near the cosmological singularity

For the case of arbitrary hydrodynamical matter, we generalize the quasi-isotropic solution of Einstein equations near the cosmological singularity, found by Lifshitz and Khalatnikov in 1960 for the

The Case for a positive cosmological Lambda term

Recent observations of Type 1a supernovae indicating an accelerating universe have once more drawn attention to the possible existence, at the present epoch, of a small positive Lambda-term

Problems of relativistic cosmology

CONTENTS I. Features of cosmological solutions of the gravitational equations 495 1. Introduction 495 2. General solution with fictitious singularity 496 3. Anisotropic solution with singularity 500

Quasi-isotropic solution containing an electromagnetic and a real massless scalar field

We analyse the dynamical evolution, near the cosmological singularity, of a quasi-isotropic universe containing an electromagnetic and a real massless scalar field. In particular, we show how the

Big-Bang Model Without Singularities

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
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