k-essence and extended tachyons in brane-worlds

Details k-essence and extended tachyons in brane-worlds k-essence and extended tachyons in brane-worlds

2010-02-02

arxiv.org/abs/1002.0369v1

J.Phys.Conf.Ser.229:012028,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, jpconf.cls, to appear in Proceedings of Spanish Relativity Meeting 2009 (ERE 09)

Scientific paper

10.1088/1742-6596/229/1/012028

We study a k-essence field evolving linearly with the cosmic time and the atypical k-essence model on a homogeneous and isotropic flat 3-brane. We show that the k-field is driven by an inverse quadratic polynomial potential. The solutions represent expanding, contracting or bouncing universes with a finite time span and some of them end in a big crunch or a big rip. Besides, by selecting the extended tachyonic kinetic functions we analyze the high and low energy limits of our model, obtaining the nearly power law solution. We introduce a tachyon field with negative energy density and show that the universe evolves between two singularities.

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