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

Class.Quant.Grav.23:4915-4937,2006 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...

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Hauptverfasser: Leach, Jannie A, Carloni, Sante, Dunsby, Peter K S
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Sprache:eng
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Zusammenfassung:Class.Quant.Grav.23:4915-4937,2006 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.
DOI:10.48550/arxiv.gr-qc/0603012