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Journal of Gravity
Volume 2013 (2013), Article ID 306417, 10 pages
http://dx.doi.org/10.1155/2013/306417
Research Article

Stiff Fluid in Accelerated Universes with Torsion

Department of Physics, Donetsk National Technical University, Kirova Street 51, Gorlovka 84646, Ukraine

Received 16 February 2013; Accepted 18 March 2013

Academic Editor: Sergei Odintsov

Copyright © 2013 Almaz Galiakhmetov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The flat Friedmann universes filled by stiff fluid and a nonminimally coupled material scalar field with polynomial potentials of the fourth degree are considered in the framework of the Einstein-Cartan theory. Exact general solution is obtained for arbitrary positive values of the coupling constant . A comparative analysis of the cosmological models with and without stiff fluid is carried out. Some effects of stiff fluid are elucidated. It is shown that singular models with a de Sitter asymptotic and with the power-law asymptotic at late times are possible. It is found that is a specific value of the coupling constant. It is demonstrated that the bouncing models without the particle horizon and with an accelerated expansion by a de Sitter law of an evolution at late times are admissible.