Abstract
The Bianchi I cosmological models containing radiation, 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 (ECT). Exact partial solutions are obtained for arbitrary positive values of the coupling constant ξ. The restrictions on ξ are found from the integrability conditions. It is demonstrated that singular models with the asymptotical isotropization by the de Sitter type and by the power-law (t4/3) type at late-times are possible. It is shown that the bouncing models with the isotropization by the de Sitter law of expansion at late-times are admissible. The role of sources in the evolution of models is elucidated.
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