Crossing the phantom barrier with purely kinetic multiple k-essence
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...
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| Autores principales: | , |
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| Formato: | Artículo publishedVersion |
| Publicado: |
2006
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v639_n6_p591_Chimento https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_03702693_v639_n6_p591_Chimento_oai |
| Aporte de: |
| Sumario: | 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. © 2006 Elsevier B.V. All rights reserved. |
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