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Abstract:

We investigate a k-essence field localized on the brane evolving linearly with the cosmological time for some kinetic functions and consider the atypical k-essence model for linear and nonlinear k-fields in FriedmannRobertsonWalker (FRW) cosmology. In the former case the k-field is driven by an inverse quadratic polynomial potential and the solutions exhibit several different behaviors which include expanding, contracting and bouncing universes as well as a model with a finite time span, some of them ending in a big crunch or a big rip. In the latter case we find the potential and show that the atypical k-essence model is dynamically incomplete. Particularly, by selecting the extended tachyonic kinetic functions we analyze the high and low energy limits of our model, obtaining the nearly power-law solution. We introduce a tachyon field with negative energy density and show that the universe evolves between two singularities. © 2011 World Scientific Publishing Company.

Registro:

Documento: Artículo
Título:K-essence and tachyons in braneworld cosmology
Autor:Chimento, L.P.; Richarte, M.G.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón I, 1428 Buenos Aires, Argentina
Palabras clave:braneworld; cosmological singularities; extended tachyons; k-essence
Año:2011
Volumen:20
Número:9
Página de inicio:1705
Página de fin:1712
DOI: http://dx.doi.org/10.1142/S0218271811019736
Título revista:International Journal of Modern Physics D
Título revista abreviado:Int. J. Mod. Phys. D
ISSN:02182718
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v20_n9_p1705_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Richarte, M.G. (2011) . K-essence and tachyons in braneworld cosmology. International Journal of Modern Physics D, 20(9), 1705-1712.
http://dx.doi.org/10.1142/S0218271811019736
---------- CHICAGO ----------
Chimento, L.P., Richarte, M.G. "K-essence and tachyons in braneworld cosmology" . International Journal of Modern Physics D 20, no. 9 (2011) : 1705-1712.
http://dx.doi.org/10.1142/S0218271811019736
---------- MLA ----------
Chimento, L.P., Richarte, M.G. "K-essence and tachyons in braneworld cosmology" . International Journal of Modern Physics D, vol. 20, no. 9, 2011, pp. 1705-1712.
http://dx.doi.org/10.1142/S0218271811019736
---------- VANCOUVER ----------
Chimento, L.P., Richarte, M.G. K-essence and tachyons in braneworld cosmology. Int. J. Mod. Phys. D. 2011;20(9):1705-1712.
http://dx.doi.org/10.1142/S0218271811019736