Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 23, Issue 15, Pages 4915-4937Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/23/15/011
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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 approach a constant value.
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