Power-low expansion in k-essence cosmology

We study spatially flat isotropic universes driven by k-essence. It is shown that Friedmann and k-field equations may be analytically integrated for arbitrary k-field potentials during evolution with a constant baryotropic index. It follows that there is an infinite number of dynamically different k...

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Detalles Bibliográficos
Autores principales: Chimento, L.P., Feinstein, A.
Formato: JOUR
Materias:
Cosmology
General relativity
k-essence
article
cosmos
evolution
gravity
hydrodynamics
mathematical model
phenomenology
quantum theory
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02177323_v19_n10_p761_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02177323_v19_n10_p761_Chimento
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spelling todo:paper_02177323_v19_n10_p761_Chimento2023-10-03T15:10:21Z Power-low expansion in k-essence cosmology Chimento, L.P. Feinstein, A. Cosmology General relativity k-essence article cosmos evolution gravity hydrodynamics mathematical model phenomenology quantum theory We study spatially flat isotropic universes driven by k-essence. It is shown that Friedmann and k-field equations may be analytically integrated for arbitrary k-field potentials during evolution with a constant baryotropic index. It follows that there is an infinite number of dynamically different k-theories with equivalent kinematics of the gravitational field. We show that there is a large "window" of stable solutions, and that the dust-like behavior separates stable from unstable expansion. Restricting to the family of power law solutions, it is argued that the linear scalar field model, with constant function F, is isomorphic to a model with divergent speed of sound and this makes them less suitable for cosmological modeling than the nonlinear k-field solutions we find in this paper. Fil:Chimento, L.P. 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_02177323_v19_n10_p761_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 Cosmology
General relativity
k-essence
article
cosmos
evolution
gravity
hydrodynamics
mathematical model
phenomenology
quantum theory
spellingShingle Cosmology
General relativity
k-essence
article
cosmos
evolution
gravity
hydrodynamics
mathematical model
phenomenology
quantum theory
Chimento, L.P.
Feinstein, A.
Power-low expansion in k-essence cosmology
topic_facet Cosmology
General relativity
k-essence
article
cosmos
evolution
gravity
hydrodynamics
mathematical model
phenomenology
quantum theory
description We study spatially flat isotropic universes driven by k-essence. It is shown that Friedmann and k-field equations may be analytically integrated for arbitrary k-field potentials during evolution with a constant baryotropic index. It follows that there is an infinite number of dynamically different k-theories with equivalent kinematics of the gravitational field. We show that there is a large "window" of stable solutions, and that the dust-like behavior separates stable from unstable expansion. Restricting to the family of power law solutions, it is argued that the linear scalar field model, with constant function F, is isomorphic to a model with divergent speed of sound and this makes them less suitable for cosmological modeling than the nonlinear k-field solutions we find in this paper.
format JOUR
author Chimento, L.P.
Feinstein, A.
author_facet Chimento, L.P.
Feinstein, A.
author_sort Chimento, L.P.
title Power-low expansion in k-essence cosmology
title_short Power-low expansion in k-essence cosmology
title_full Power-low expansion in k-essence cosmology
title_fullStr Power-low expansion in k-essence cosmology
title_full_unstemmed Power-low expansion in k-essence cosmology
title_sort power-low expansion in k-essence cosmology
url http://hdl.handle.net/20.500.12110/paper_02177323_v19_n10_p761_Chimento
work_keys_str_mv AT chimentolp powerlowexpansioninkessencecosmology
AT feinsteina powerlowexpansioninkessencecosmology
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