# Power spectra of scalar and tensor modes in modified Horava-Lifshitz gravity

@article{Chen2009PowerSO, title={Power spectra of scalar and tensor modes in modified Horava-Lifshitz gravity}, author={Bin Chen and Shi Pi and Jin-zhang Tang}, journal={arXiv: High Energy Physics - Theory}, year={2009} }

In Horava-Lifshitz gravity, the extra dynamical scalar mode could play significant role in cosmology. However it has been pointed out that such a scalar may suffer from the strong coupling problem in IR. We address this issue in this paper. Our analysis shows that the scalar mode could decouple naturally at \lambda=1 due to the extra gauge symmetry. On the other hand, the fact that the scalar mode becomes ghost when 1/3<\lambda<1 is a real challenge to the theory. We try to overcome this…

## 12 Citations

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