Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-08-20
Phys.Lett.B696:426-431,2011
Physics
High Energy Physics
High Energy Physics - Theory
11pages
Scientific paper
10.1016/j.physletb.2010.12.066
We investigate the Hamiltonian structure of linearized extended Ho\v{r}ava- Lifshitz gravity in a flat cosmological background following the Faddeev-Jackiw's Hamiltonian reduction formalism. The Hamiltonian structure of extended Ho\v{r}ava-Lifshitz gravity is similar to that of the projectable version of original Ho\v{r}ava-Lifshitz gravity, in which there is one primary constraint and so there are two physical degrees of freedom. We also find that extra scalar graviton mode in an inflationary background can be decoupled from the matter field in the infrared (IR) limit, but it is coupled to the matter field in a general cosmological background. But it is necessary to go beyond linear order in order to draw any conclusion of the strong coupling problem.
Koh Seoktae
Shin Sunyoung
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