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.
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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