Massive graviton propagation of the deformed Ho\v{r}ava-Lifshitz gravity without projectability condition
Abstract
We study graviton propagations of scalar, vector, and tensor modes in the deformed Ho\v{r}ava-Lifshitz gravity (-model) without projectability condition. The quadratic Lagrangian is invariant under diffeomorphism only for case, which contradicts to the fact that is irrelevant to a consistent Hamiltonian approach to the model. In this case, as far as scalar propagations are concerned, there is no essential difference between deformed Ho\v{r}ava-Lifshitz gravity (-model) and general relativity. This implies that there are two degrees of freedom for a massless graviton without Ho\v{r}ava scalar, and five degrees of freedom appear for a massive graviton when introducing Lorentz-violating and Fierz-Pauli mass terms. Finally, it is shown that for , the vDVZ discontinuity is absent in the massless limit of Lorentz-violating mass terms by considering external source terms.
Keywords
Cite
@article{arxiv.1004.2552,
title = {Massive graviton propagation of the deformed Ho\v{r}ava-Lifshitz gravity without projectability condition},
author = {Yun Soo Myung},
journal= {arXiv preprint arXiv:1004.2552},
year = {2014}
}
Comments
21 pages, no figure, version to appear in PLB