# Pure Kinetic K-essence as the Cosmic Speed-Up

@article{Tsyba2010PureKK, title={Pure Kinetic K-essence as the Cosmic Speed-Up}, author={Petr Tsyba and I. I. Kulnazarov and Koblandy Yerzhanov and Ratbay Myrzakulov}, journal={International Journal of Theoretical Physics}, year={2010}, volume={50}, pages={1876-1886} }

In this paper, we consider three types of k-essence. These k-essence models were presented in the parametric forms. The exact analytical solutions of the corresponding equations of motion are found. It is shown that these k-essence models for the presented solutions can give rise to cosmic acceleration.

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## References

SHOWING 1-10 OF 123 REFERENCES

Restrictions on Purely Kinetic K-Essence

- Physics
- 2011

We restrict purely kinetic k-essence. Assuming that the equation of state is a power law of the kinetic energy, i.e. w = w0Xα, we find that α must be positive to obtain accelerated phases,…

Towards the unification of late-time acceleration and inflation by k-essence model

- Physics
- 2011

Based on the formulation of the reconstruction for the k-essence model, which was recently proposed in [1], we explicitly construct cosmological model to unifying the late-time acceleration and the…

Theoretical Constraint on Purely Kinetic k -Essence

- Physics
- 2008

Purely kinetic k-essence models in which the Lagrangian contains only a kinetic factor and does not depend explicitly on the field itself are considered, and a theoretical constraint is obtained: Fx…

Dark torsion as the cosmic speed-up

- Physics
- 2009

It is shown that the recently detected acceleration of the Uuniverse can be understood by considering a modification of the teleparallel equivalent of general relativity, with no need of dark energy.…

No-go theorem for k-essence dark energy.

- PhysicsPhysical review letters
- 2006

We demonstrate that if k-essence can solve the coincidence problem and play the role of dark energy in the Universe, the fluctuations of the field have to propagate superluminally at some stage. We…

k-Essence, superluminal propagation, causality and emergent geometry

- Philosophy
- 2008

The k-essence theories admit in general the superluminal propagation of the perturbations on classical backgrounds. We show that in spite of the superluminal propagation the causal paradoxes do not…

On the ΛCDM Universe in f(G) gravity

- Physics
- 2010

In the context of the so-called Gauss–Bonnet gravity, where the gravitational action includes function of the Gauss–Bonnet invariant, we study cosmological solutions, especially the well-known ΛCDM…

The Cosmological Constant Problem

- Physics
- 1989

Astronomical observations indicate that the cosmological constant is many orders of magnitude smaller than estimated in modern theories of elementary particles. After a brief review of the history of…