Anisotropic k-essence cosmologies

We investigate a Bianchi type-I cosmology with k-essence and find the set of models which dissipate the initial anisotropy. There are cosmological models with extended tachyon fields and k-essence having a constant barotropic index. We obtain the conditions leading to a regular bounce of the average...

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Detalles Bibliográficos
Autores principales: Chimento, Luis Pascual, Forte, Mónica Isabel
Publicado: 2006
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v73_n6_p_Chimento
http://hdl.handle.net/20.500.12110/paper_15507998_v73_n6_p_Chimento
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v73_n6_p_Chimento
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spelling paper:paper_15507998_v73_n6_p_Chimento2023-06-08T16:21:59Z Anisotropic k-essence cosmologies Chimento, Luis Pascual Forte, Mónica Isabel We investigate a Bianchi type-I cosmology with k-essence and find the set of models which dissipate the initial anisotropy. There are cosmological models with extended tachyon fields and k-essence having a constant barotropic index. We obtain the conditions leading to a regular bounce of the average geometry and the residual anisotropy on the bounce. For constant potential, we develop purely kinetic k-essence models which are dust dominated in their early stages, dissipate the initial anisotropy, and end in a stable de Sitter accelerated expansion scenario. We show that linear k-field and polynomial kinetic function models evolve asymptotically to Friedmann-Robertson-Walker cosmologies. The linear case is compatible with an asymptotic potential interpolating between Vl -γl, in the shear dominated regime, and Vl -2 at late time. In the polynomial case, the general solution contains cosmological models with an oscillatory average geometry. For linear k-essence, we find the general solution in the Bianchi type-I cosmology when the k field is driven by an inverse square potential. This model shares the same geometry as a quintessence field driven by an exponential potential. © 2006 The American Physical Society. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Forte, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v73_n6_p_Chimento http://hdl.handle.net/20.500.12110/paper_15507998_v73_n6_p_Chimento
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We investigate a Bianchi type-I cosmology with k-essence and find the set of models which dissipate the initial anisotropy. There are cosmological models with extended tachyon fields and k-essence having a constant barotropic index. We obtain the conditions leading to a regular bounce of the average geometry and the residual anisotropy on the bounce. For constant potential, we develop purely kinetic k-essence models which are dust dominated in their early stages, dissipate the initial anisotropy, and end in a stable de Sitter accelerated expansion scenario. We show that linear k-field and polynomial kinetic function models evolve asymptotically to Friedmann-Robertson-Walker cosmologies. The linear case is compatible with an asymptotic potential interpolating between Vl -γl, in the shear dominated regime, and Vl -2 at late time. In the polynomial case, the general solution contains cosmological models with an oscillatory average geometry. For linear k-essence, we find the general solution in the Bianchi type-I cosmology when the k field is driven by an inverse square potential. This model shares the same geometry as a quintessence field driven by an exponential potential. © 2006 The American Physical Society.
author Chimento, Luis Pascual
Forte, Mónica Isabel
spellingShingle Chimento, Luis Pascual
Forte, Mónica Isabel
Anisotropic k-essence cosmologies
author_facet Chimento, Luis Pascual
Forte, Mónica Isabel
author_sort Chimento, Luis Pascual
title Anisotropic k-essence cosmologies
title_short Anisotropic k-essence cosmologies
title_full Anisotropic k-essence cosmologies
title_fullStr Anisotropic k-essence cosmologies
title_full_unstemmed Anisotropic k-essence cosmologies
title_sort anisotropic k-essence cosmologies
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v73_n6_p_Chimento
http://hdl.handle.net/20.500.12110/paper_15507998_v73_n6_p_Chimento
work_keys_str_mv AT chimentoluispascual anisotropickessencecosmologies
AT fortemonicaisabel anisotropickessencecosmologies
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