Artículo
Power-low expansion in k-essence cosmology
Fecha de publicación:
12/2004
Editorial:
World Scientific
Revista:
Modern Physics Letters A: Particles and Fields; Gravitation; Cosmology and Nuclear Physics
ISSN:
0217-7323
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Cosmology
,
General Relativity
,
K-Essence
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
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
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