# 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…

## 2 Citations

### 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…

## References

SHOWING 1-10 OF 51 REFERENCES

### Bulk Viscosity Effects on the Early Universe Stability

- Physics
- 2005

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

- Physics, Mathematics
- 1999

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

- 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…

### 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…

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

- Physics, Mathematics
- 2002

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

- Physics
- 1999

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

- Physics
- 1964

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

- Physics, Mathematics
- 2000

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

- 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…