Crossing the phantom divide with k-essence in braneworlds
We study a flat three-brane in the presence of a linear k field with nonzero cosmological constant Λ 4 . In this model the crossing of the phantom divide (PD) occurs when the k-essence energy density becomes negative. We show that in the high energy regime the effective equation of state has a resem...
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_02177323_v25_n29_p2469_Chimento |
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todo:paper_02177323_v25_n29_p2469_Chimento2023-10-03T15:10:23Z Crossing the phantom divide with k-essence in braneworlds Chimento, L.P. Forte, M. Richarte, M.G. Braneworlds k-essence phantom divide We study a flat three-brane in the presence of a linear k field with nonzero cosmological constant Λ 4 . In this model the crossing of the phantom divide (PD) occurs when the k-essence energy density becomes negative. We show that in the high energy regime the effective equation of state has a resemblance of a modified Chaplygin gas while in the low energy regime it becomes linear. We find a scale factor that begins from a singularity and evolves to a de Sitter stable stage while other solutions have a super-accelerated regime and end with a big rip. We use the energy conditions to show when the effective equation of state of the brane-universe crosses the PD. © 2010 World Scientific Publishing Company. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02177323_v25_n29_p2469_Chimento |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Braneworlds k-essence phantom divide |
| spellingShingle |
Braneworlds k-essence phantom divide Chimento, L.P. Forte, M. Richarte, M.G. Crossing the phantom divide with k-essence in braneworlds |
| topic_facet |
Braneworlds k-essence phantom divide |
| description |
We study a flat three-brane in the presence of a linear k field with nonzero cosmological constant Λ 4 . In this model the crossing of the phantom divide (PD) occurs when the k-essence energy density becomes negative. We show that in the high energy regime the effective equation of state has a resemblance of a modified Chaplygin gas while in the low energy regime it becomes linear. We find a scale factor that begins from a singularity and evolves to a de Sitter stable stage while other solutions have a super-accelerated regime and end with a big rip. We use the energy conditions to show when the effective equation of state of the brane-universe crosses the PD. © 2010 World Scientific Publishing Company. |
| format |
JOUR |
| author |
Chimento, L.P. Forte, M. Richarte, M.G. |
| author_facet |
Chimento, L.P. Forte, M. Richarte, M.G. |
| author_sort |
Chimento, L.P. |
| title |
Crossing the phantom divide with k-essence in braneworlds |
| title_short |
Crossing the phantom divide with k-essence in braneworlds |
| title_full |
Crossing the phantom divide with k-essence in braneworlds |
| title_fullStr |
Crossing the phantom divide with k-essence in braneworlds |
| title_full_unstemmed |
Crossing the phantom divide with k-essence in braneworlds |
| title_sort |
crossing the phantom divide with k-essence in braneworlds |
| url |
http://hdl.handle.net/20.500.12110/paper_02177323_v25_n29_p2469_Chimento |
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AT chimentolp crossingthephantomdividewithkessenceinbraneworlds AT fortem crossingthephantomdividewithkessenceinbraneworlds AT richartemg crossingthephantomdividewithkessenceinbraneworlds |
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