Crossing the phantom barrier with purely kinetic multiple k-essence

Details Crossing the phantom barrier with purely kinetic multiple k-essence Crossing the phantom barrier with purely kinetic multiple k-essence

2006-04-05

arxiv.org/abs/astro-ph/0604090v1

Phys.Lett. B639 (2006) 591-595

Astronomy and Astrophysics

Astrophysics

5 pages, revtex

Scientific paper

10.1016/j.physletb.2006.07.017

We consider multiple k-essence sources and obtain the conditions their kinetic functions must satisfy so that purely kinetic k-essences lead to models with phantom barrier crossing. After that, we show that polynomial kinetic functions allow the integration of the dynamical equations determining the geometry and the k-fields. The models thus obtained have accelerated expansion at late cosmic time, representing universes ending at a finite time with a big rip singularity. In addition, these models begin to evolve from an initial singularity, so they have a finite time span.

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