# ON THE QUASI-ISOTROPIC INFLATIONARY SOLUTION

@article{Imponente2003ONTQ, title={ON THE QUASI-ISOTROPIC INFLATIONARY SOLUTION}, author={Giovanni Paolo Imponente and Giovanni Montani}, journal={International Journal of Modern Physics D}, year={2003}, volume={12}, pages={1845-1857} }

In this paper we find a solution for a quasi-isotropic inflationary Universe which allows to introduce in the problem a certain degree of inhomogeneity. We consider a model which generalizes the (flat) FLRW one by introducing a first order inhomogeneous term, whose dynamics is induced by an effective cosmological constant. The 3-metric tensor is constituted by a dominant term, corresponding to an isotropic-like component, while the amplitude of the first order one is controlled by a "small…

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## References

SHOWING 1-10 OF 40 REFERENCES

Quasi-isotropization of the inhomogeneous mixmaster universe induced by an inflationary process

- Physics
- 2002

We derive a ``generic'' inhomogeneous ``bridge'' solution for a cosmological model in the presence of a real self-interacting scalar field. This solution connects a Kasner-like regime to an…

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…

On the generic cosmological solution in the presence of ultrarelativistic matter and a scalar field

- Physics
- 2000

This paper provides a detailed analysis of the asymptotic behaviour, toward the initial singularity, of the general cosmological solution containing ultrarelativistic matter and a scalar field. In…

Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges

- Physics
- 1995

This paper presents a systematic treatment of the linear theory of scalar gravitational perturbations in the synchronous gauge and the conformal Newtonian (or longitudinal) gauge. It differs from…

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…

Nonlinear behaviors of cosmological inhomogeneities with a standard fluid and inflationary matter.

- MathematicsPhysical review. D, Particles and fields
- 1994

Nonlinear behaviors of cosmological inhomogeneities are studied in the anti-Newtonian or long-wavelength approximation and it is shown that the growth is gradually prevented and finally they decay.

Inflationary universe: A possible solution to the horizon and flatness problems

- Physics
- 1981

The standard model of hot big-bang cosmology requires initial conditions which are problematic in two ways: (1) The early universe is assumed to be highly homogeneous, in spite of the fact that…

Semiclassicality and decoherence of cosmological perturbations

- Physics
- 1996

Transition to the semiclassical behaviour and the decoherence process for inhomogeneous perturbations generated from the vacuum state during an inflationary stage in the early Universe are considered…

Influence of scalar fields on the approach to a cosmological singularity

- Physics
- 1999

The method of consistent potentials (MCP) is used to explain how a minimally coupled (classical) scalar field can suppress mixmaster oscillations in the approach to the singularity of generic…

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…