Power-low expansion in k-essence cosmology
- Autores
- Chimento, Luis Pascual; Feinstein, Alexander
- Año de publicación
- 2004
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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, Luis Pascual. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Fil: Feinstein, Alexander. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España - Materia
-
Cosmology
General Relativity
K-Essence - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/74200
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Power-low expansion in k-essence cosmologyChimento, Luis PascualFeinstein, AlexanderCosmologyGeneral RelativityK-Essencehttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We 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, Luis Pascual. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaFil: Feinstein, Alexander. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; EspañaWorld Scientific2004-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/74200Chimento, Luis Pascual; Feinstein, Alexander; Power-low expansion in k-essence cosmology; World Scientific; Modern Physics Letters A: Particles and Fields; Gravitation; Cosmology and Nuclear Physics; 19; 10; 12-2004; 761-7680217-7323CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1142/S0217732304013507info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:11:55Zoai:ri.conicet.gov.ar:11336/74200instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:11:55.907CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Power-low expansion in k-essence cosmology |
title |
Power-low expansion in k-essence cosmology |
spellingShingle |
Power-low expansion in k-essence cosmology Chimento, Luis Pascual Cosmology General Relativity K-Essence |
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 |
dc.creator.none.fl_str_mv |
Chimento, Luis Pascual Feinstein, Alexander |
author |
Chimento, Luis Pascual |
author_facet |
Chimento, Luis Pascual Feinstein, Alexander |
author_role |
author |
author2 |
Feinstein, Alexander |
author2_role |
author |
dc.subject.none.fl_str_mv |
Cosmology General Relativity K-Essence |
topic |
Cosmology General Relativity K-Essence |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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, Luis Pascual. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina Fil: Feinstein, Alexander. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España |
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. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/74200 Chimento, Luis Pascual; Feinstein, Alexander; Power-low expansion in k-essence cosmology; World Scientific; Modern Physics Letters A: Particles and Fields; Gravitation; Cosmology and Nuclear Physics; 19; 10; 12-2004; 761-768 0217-7323 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/74200 |
identifier_str_mv |
Chimento, Luis Pascual; Feinstein, Alexander; Power-low expansion in k-essence cosmology; World Scientific; Modern Physics Letters A: Particles and Fields; Gravitation; Cosmology and Nuclear Physics; 19; 10; 12-2004; 761-768 0217-7323 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1142/S0217732304013507 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
World Scientific |
publisher.none.fl_str_mv |
World Scientific |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1842270177078542336 |
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13.13397 |