Future state of the universe

@article{Dabrowski2006FutureSO,
  title={Future state of the universe},
  author={Mariusz P. Da̧browski},
  journal={Annalen der Physik},
  year={2006},
  volume={15}
}
Following the observational evidence for cosmic acceleration which may exclude a possibility for the universe to recollapse to a second singularity, we review alternative scenarios of its future evolution. Although the de Sitter asymptotic state is still an option, some other asymptotic states which allow new types of singularities such as Big‐Rip (due to a phantom matter) and sudden future singularities are also admissible and are reviewed in detail. The reality of these singularities which… 

Constraining sudden future singularity models

One of the key challenges facing cosmologists today is the nature of the mysterious dark energy introduced in the standard model of cosmology to account for the current accelerating expansion of the

Constraining sudden future singularity models

One of the key challenges facing cosmologists today is the nature of the mysterious dark energy introduced in the standard model of cosmology to account for the current accelerating expansion of the

Cosmological dynamics of ‘exponential gravity’

We present a detailed investigation of the cosmological dynamics based on exp(−R/Λ) gravity. We apply the dynamical system approach to both the vacuum and matter cases and obtain exact solutions and

Expanding Universe: slowdown or speedup?

The kinematics and the dynamical interpretation of cosmological expansion are reviewed in a widely accessible manner with emphasis on the acceleration aspect. Virtually all the approaches that can in

Cosmological Models with Big Rip and Pseudo Rip Scenarios in Extended Theory of Gravity

In this paper, we have presented the big rip and pseudo rip cosmological models in an extended theory of gravity. The matter field is considered to be that of perfect fluid. The geometrical

Big Bang Singularity Resolution In Quantum Cosmology

We evaluate the physical viability and logical strength of an array of putative criteria for big bang singularity resolution in quantum cosmology. Based on this analysis, we propose a mutually

Big Rip Scenario in Brans-Dicke Theory

In this work, we present a Big Rip scenario within the framework of the generalized Brans-Dicke (GBD) theory. In the GBD theory, we consider an evolving BD parameter along with a self-interacting

Quantum phantom cosmology

We apply the formalism of quantum cosmology to models containing a phantom field. Three models are discussed explicitly: a toy model, a model with an exponential phantom potential, and a model with

A PROBLEM OF COSMOLOGICAL TIME IN THE DE SITTER SPACE-TIME

Since the generalized representation of de Sitter solution does not constrain the values of integration functions, there are infinitely many such synchronous coordinate systems and, therefore, the matching ofde Sitter solutions and general Tolman solution is possible and it is impossible to introduce a notion of universal cosmological time in the de Sitters Universe.

References

SHOWING 1-10 OF 61 REFERENCES

More general sudden singularities

We present a general form for the solution of an expanding general-relativistic Friedmann universe that encounters a singularity at finite future time. The singularity occurs in the material pressure

Geodesic behavior of sudden future singularities

In this paper we analyze the effect of recently proposed classes of sudden future singularities on causal geodesics of FLRW spacetimes. Geodesics are shown to be extendible and just the equations for

Observable quantities in cosmological models with strings

The Friedman equation for the universe with arbitrary curvature filled with mutually noninteracting pressureless dust, radiation, cosmological constant, and strings is considered. The explicit

New isotropic and anisotropic sudden singularities

We show the existence of an infinite family of finite-time singularities in isotropically expanding universes which obey the weak, strong and dominant energy conditions. We show what new type of

Designing cyclic universe models.

It is shown that cyclic models require a comparable degree of tuning to that needed for inflationary models, and the constraints are reduced to a set of simple design rules including "fast-roll" parameters analogous to the "slow- roll" parameters in inflation.

Inhomogenized sudden future singularities

We find that sudden future singularities of pressure may also appear in spatially inhomogeneous Stephani models of the universe. They are temporal pressure singularities and may appear independently
...