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- W2170599523 abstract "We study cosmological vector and tensor perturbations in Horava-Lifshitz gravity, adopting the most general Sotiriou-Visser-Weinfurtner generalization without the detailed balance but with projectability condition. After deriving the general formulas in a flat FRW background, we find that the vector perturbations are identical to those given in general relativity. This is true also in the non-flat cases. For the tensor perturbations, high order derivatives of the curvatures produce effectively an anisotropic stress, which could have significant efforts on the high-frequency modes of gravitational waves, while for the low-frenquency modes, the efforts are negligible. The power spectrum is scale-invariant in the UV regime, because of the particular dispersion relations. But, due to lower-order corrections, it will eventually reduce to that given in GR in the IR limit. Applying the general formulas to the de Sitter and power-law backgrounds, we calculate the power spectrum and index, using the uniform approximations, and obtain their analytical expressions in both cases." @default.
- W2170599523 created "2016-06-24" @default.
- W2170599523 creator A5040339182 @default.
- W2170599523 date "2010-12-29" @default.
- W2170599523 modified "2023-09-27" @default.
- W2170599523 title "Vector and tensor perturbations in Horava-Lifshitz cosmology" @default.
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- W2170599523 doi "https://doi.org/10.1103/physrevd.82.124063" @default.
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