Crossing the phantom barrier with purely kinetic multiple k-essence

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

References in corpus (2)

• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?

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