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2014

Unifying framework for scalar-tensor theories of gravity

Gao, Xian

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A general framework for effective theories propagating two tensor and one scalar degrees of freedom is investigated.

Geometrically, it describes dynamical foliation of spacelike hypersurfaces coupled to a general background, in which the scalar mode encodes the fluctuation of the hypersurfaces.
Within this framework, various models in the literature---including $k$-essence, Horndeski theory, the effective field theory of inflation, ghost condensate as well as the Ho\v{r}ava gravity---get unified.
Our framework generalizes the Horndeski theory in the sense that, it propagates the correct number of degrees of freedom, although the equations of motion are generally higher order.

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M. Li and Y. Pang, JHEP 0908

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C. Deffayet, G. Esposito-Farese, and A. Vikman, Phys.Rev. D79

Cited in the paper.

X. Gao, (to appear)

Cited in the paper.

J. Gleyzes, D. Langlois, F. Piazza, and F. Vernizzi, (2014), arXiv:1404.6495 [hep-th]

2014

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