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Shear dynamics in Bianchi I cosmologies with R^n-gravity

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arxiv gr-qc/0603012 v2 pith:6JYYKSUN submitted 2006-03-06 gr-qc astro-phhep-th

classification gr-qcastro-phhep-th
keywords bianchishearcosmologiesdynamicsn-gravityanalysisanisotropiesapproaches
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We give the equations governing the shear evolution in Bianchi spacetimes for general f(R)-theories of gravity. We consider the case of R^n-gravity and perform a detailed analysis of the dynamics in Bianchi I cosmologies which exhibit local rotational symmetry. We find exact solutions and study their behaviour and stability in terms of the values of the parameter n. In particular, we found a set of cosmic histories in which the universe is initially isotropic, then develops shear anisotropies which approaches a constant value.

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