Remarks on the Scalar Graviton Decoupling and Consistency of Horava Gravity

Details Remarks on the Scalar Graviton Decoupling and Consistency of Horava Gravity Remarks on the Scalar Graviton Decoupling and Consistency of Horava Gravity

2009-10-10

arxiv.org/abs/0910.1917v4

Class.Quant.Grav.28:015004,2011

Physics

High Energy Physics

High Energy Physics - Theory

Some clarifications regarding the projectable case added, Typos corrected, Comments (Footnote No.9, Note Added) added, Referen

Scientific paper

10.1088/0264-9381/28/1/015004

Recently Horava proposed a renormalizable gravity theory with higher derivatives by abandoning the Lorenz invariance in UV. But there have been confusions regarding the extra scalar graviton mode and the consistency of the Horava model. I reconsider these problems and show that, in the Minkowski vacuum background, the scalar graviton mode can be consistency decoupled from the usual tensor graviton modes by imposing the (local) Hamiltonian as well as the momentum constraints.

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