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Scalar graviton in the healthy extension of Ho\v{r}ava-Lifshitz theory · Around

2010

Scalar graviton in the healthy extension of Ho\v{r}ava-Lifshitz theory

Cai, Rong-Gen, Hu, Bin, Zhang, Hong-Bo

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In this note we study the linear dynamics of scalar graviton in a de Sitter background in the infrared limit of the healthy extension of Ho\v{r}ava-Lifshitz gravity with the dynamical critical exponent $z=3$.

Both our analytical and numerical results show that the non-zero Fourier modes of scalar graviton oscillate with an exponentially damping amplitude on the sub-horizon scale, while on the super-horizon scale, the phases are frozen and they approach to some asymptotic values.
In addition, as the case of the non-zero modes on super-horizon scale, the zero mode also initially decays exponentially and then approaches to an asymptotic constant value.

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