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Stability of the Einstein static universe in IR modified Horava gravity

C. G. B÷hmer, F. S. N. Lobo

Abstract
Recently, Horava proposed a power counting renormalizable theory for(3+1)-dimensional quantum gravity, which reduces to Einstein gravity with a non-vanishing cosmological constant in IR, but possesses improved UV behaviors. In this work, we analyze the stability of the Einstein static universe by considering linear homogeneous perturbations in the context of an IR modification of Horava gravity, which implies a `soft' breaking of the `detailed balance' condition. The stability regions of the Einstein static universe is parameterized by the linear equation of state parameter w= p/ rho and the parameters appearing in the Horava theory, and it is shown that a large class of stable solutions exists in the respective parameter space.

The European Physical Journal C
Volume 70, Issue 4, Page 1111
2010 November

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Instituto de Astrof├şsica e Ci├¬ncias do Espa├žo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda├ž├úo para a Ci├¬ncia e a Tecnologia
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