Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies

We investigate a flat Friedmann-Robertson-Walker spacetime filled with k essence and find the set of functions F that generate three different families of extended tachyon fields and Chaplygin gases. They lead to accelerated and superaccelerated expanding scenarios. For any function F, we find the f...

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Detalles Bibliográficos
Autor principal: Chimento, Luis Pascual
Publicado: 2004
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v69_n12_p_Chimento
http://hdl.handle.net/20.500.12110/paper_05562821_v69_n12_p_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_05562821_v69_n12_p_Chimento
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spelling paper:paper_05562821_v69_n12_p_Chimento2023-06-08T15:42:32Z Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies Chimento, Luis Pascual We investigate a flat Friedmann-Robertson-Walker spacetime filled with k essence and find the set of functions F that generate three different families of extended tachyon fields and Chaplygin gases. They lead to accelerated and superaccelerated expanding scenarios. For any function F, we find the first integral of the k-field equation when the k field is driven by an inverse square potential or by a constant one. In the former, we obtain the general solution of the coupled Einstein-k-field equations for a linear function F. This model shares the same kinematics of the background geometry with the ordinary scalar field one driven by an exponential potential. However, they are dynamically different. For a constant potential, we introduce a k-field model that exhibits a transition from a power-law phase to a de Sitter stage, inducing a modified Chaplygin gas. © 2004 The American Physical Society. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v69_n12_p_Chimento http://hdl.handle.net/20.500.12110/paper_05562821_v69_n12_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 flat Friedmann-Robertson-Walker spacetime filled with k essence and find the set of functions F that generate three different families of extended tachyon fields and Chaplygin gases. They lead to accelerated and superaccelerated expanding scenarios. For any function F, we find the first integral of the k-field equation when the k field is driven by an inverse square potential or by a constant one. In the former, we obtain the general solution of the coupled Einstein-k-field equations for a linear function F. This model shares the same kinematics of the background geometry with the ordinary scalar field one driven by an exponential potential. However, they are dynamically different. For a constant potential, we introduce a k-field model that exhibits a transition from a power-law phase to a de Sitter stage, inducing a modified Chaplygin gas. © 2004 The American Physical Society.
author Chimento, Luis Pascual
spellingShingle Chimento, Luis Pascual
Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
author_facet Chimento, Luis Pascual
author_sort Chimento, Luis Pascual
title Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
title_short Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
title_full Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
title_fullStr Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
title_full_unstemmed Extended tachyon field, Chaplygin gas, and solvable fc-essence cosmologies
title_sort extended tachyon field, chaplygin gas, and solvable fc-essence cosmologies
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v69_n12_p_Chimento
http://hdl.handle.net/20.500.12110/paper_05562821_v69_n12_p_Chimento
work_keys_str_mv AT chimentoluispascual extendedtachyonfieldchaplygingasandsolvablefcessencecosmologies
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