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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.

Registro:

Documento: Artículo
Título:Power-low expansion in k-essence cosmology
Autor:Chimento, L.P.; Feinstein, A.
Filiación:Dpto. de Física, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Dpto. de Fisica Teorica, Universidad del País Vasco, Apdo. 644, 48080, Bilbao, Spain
Palabras clave:Cosmology; General relativity; k-essence; article; cosmos; evolution; gravity; hydrodynamics; mathematical model; phenomenology; quantum theory
Año:2004
Volumen:19
Número:10
Página de inicio:761
Página de fin:768
DOI: http://dx.doi.org/10.1142/S0217732304013507
Título revista:Modern Physics Letters A
Título revista abreviado:Mod. Phys. Lett. A
ISSN:02177323
CODEN:MPLAE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02177323_v19_n10_p761_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Feinstein, A. (2004) . Power-low expansion in k-essence cosmology. Modern Physics Letters A, 19(10), 761-768.
http://dx.doi.org/10.1142/S0217732304013507
---------- CHICAGO ----------
Chimento, L.P., Feinstein, A. "Power-low expansion in k-essence cosmology" . Modern Physics Letters A 19, no. 10 (2004) : 761-768.
http://dx.doi.org/10.1142/S0217732304013507
---------- MLA ----------
Chimento, L.P., Feinstein, A. "Power-low expansion in k-essence cosmology" . Modern Physics Letters A, vol. 19, no. 10, 2004, pp. 761-768.
http://dx.doi.org/10.1142/S0217732304013507
---------- VANCOUVER ----------
Chimento, L.P., Feinstein, A. Power-low expansion in k-essence cosmology. Mod. Phys. Lett. A. 2004;19(10):761-768.
http://dx.doi.org/10.1142/S0217732304013507