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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Detalles Bibliográficos
Publicado: 2010
Materias:
Braneworlds
k-essence
phantom divide
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02177323_v25_n29_p2469_Chimento
http://hdl.handle.net/20.500.12110/paper_02177323_v25_n29_p2469_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02177323_v25_n29_p2469_Chimento
record_format dspace
spelling paper:paper_02177323_v25_n29_p2469_Chimento2023-06-08T15:21:02Z Crossing the phantom divide with k-essence in braneworlds 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. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02177323_v25_n29_p2469_Chimento 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
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.
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
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02177323_v25_n29_p2469_Chimento
http://hdl.handle.net/20.500.12110/paper_02177323_v25_n29_p2469_Chimento
_version_ 1768544314691944448

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