Crossing the phantom barrier with purely kinetic multiple k-essence
arXiv:astro-ph/0604090 · doi:10.1016/j.physletb.2006.07.017
Abstract
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.
5 pages, revtex
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