K-essence and tachyons in braneworld cosmology

We investigate a k-essence field localized on the brane evolving linearly with the cosmological time for some kinetic functions and consider the atypical k-essence model for linear and nonlinear k-fields in FriedmannRobertsonWalker (FRW) cosmology. In the former case the k-field is driven by an inve...

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Autores principales: Chimento, L.P., Richarte, M.G.
Formato: JOUR
Materias:
braneworld
cosmological singularities
extended tachyons
k-essence
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02182718_v20_n9_p1705_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02182718_v20_n9_p1705_Chimento
record_format dspace
spelling todo:paper_02182718_v20_n9_p1705_Chimento2023-10-03T15:10:57Z K-essence and tachyons in braneworld cosmology Chimento, L.P. Richarte, M.G. braneworld cosmological singularities extended tachyons k-essence We investigate a k-essence field localized on the brane evolving linearly with the cosmological time for some kinetic functions and consider the atypical k-essence model for linear and nonlinear k-fields in FriedmannRobertsonWalker (FRW) cosmology. In the former case the k-field is driven by an inverse quadratic polynomial potential and the solutions exhibit several different behaviors which include expanding, contracting and bouncing universes as well as a model with a finite time span, some of them ending in a big crunch or a big rip. In the latter case we find the potential and show that the atypical k-essence model is dynamically incomplete. Particularly, by selecting the extended tachyonic kinetic functions we analyze the high and low energy limits of our model, obtaining the nearly power-law solution. We introduce a tachyon field with negative energy density and show that the universe evolves between two singularities. © 2011 World Scientific Publishing Company. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Richarte, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02182718_v20_n9_p1705_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 braneworld
cosmological singularities
extended tachyons
k-essence
spellingShingle braneworld
cosmological singularities
extended tachyons
k-essence
Chimento, L.P.
Richarte, M.G.
K-essence and tachyons in braneworld cosmology
topic_facet braneworld
cosmological singularities
extended tachyons
k-essence
description We investigate a k-essence field localized on the brane evolving linearly with the cosmological time for some kinetic functions and consider the atypical k-essence model for linear and nonlinear k-fields in FriedmannRobertsonWalker (FRW) cosmology. In the former case the k-field is driven by an inverse quadratic polynomial potential and the solutions exhibit several different behaviors which include expanding, contracting and bouncing universes as well as a model with a finite time span, some of them ending in a big crunch or a big rip. In the latter case we find the potential and show that the atypical k-essence model is dynamically incomplete. Particularly, by selecting the extended tachyonic kinetic functions we analyze the high and low energy limits of our model, obtaining the nearly power-law solution. We introduce a tachyon field with negative energy density and show that the universe evolves between two singularities. © 2011 World Scientific Publishing Company.
format JOUR
author Chimento, L.P.
Richarte, M.G.
author_facet Chimento, L.P.
Richarte, M.G.
author_sort Chimento, L.P.
title K-essence and tachyons in braneworld cosmology
title_short K-essence and tachyons in braneworld cosmology
title_full K-essence and tachyons in braneworld cosmology
title_fullStr K-essence and tachyons in braneworld cosmology
title_full_unstemmed K-essence and tachyons in braneworld cosmology
title_sort k-essence and tachyons in braneworld cosmology
url http://hdl.handle.net/20.500.12110/paper_02182718_v20_n9_p1705_Chimento
work_keys_str_mv AT chimentolp kessenceandtachyonsinbraneworldcosmology
AT richartemg kessenceandtachyonsinbraneworldcosmology
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