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dc.contributor.author
Chimento, Luis Pascual
dc.contributor.author
Feinstein, Alexander
dc.date.available
2019-04-12T14:28:20Z
dc.date.issued
2004-12
dc.identifier.citation
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
dc.identifier.issn
0217-7323
dc.identifier.uri
http://hdl.handle.net/11336/74200
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
World Scientific
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Cosmology
dc.subject
General Relativity
dc.subject
K-Essence
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Power-low expansion in k-essence cosmology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-05T18:25:06Z
dc.journal.volume
19
dc.journal.number
10
dc.journal.pagination
761-768
dc.journal.pais
Singapur
dc.journal.ciudad
Singapur
dc.description.fil
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
dc.description.fil
Fil: Feinstein, Alexander. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia; España
dc.journal.title
Modern Physics Letters A: Particles and Fields; Gravitation; Cosmology and Nuclear Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1142/S0217732304013507
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