Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-07-09
Class.Quant.Grav.27:075005,2010
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, version published at Class. Quant. Grav
Scientific paper
10.1088/0264-9381/27/7/075005
We investigate the scalar and tensor perturbations in Horava gravity, with and without detailed balance, around a flat background. Once both types of perturbations are taken into account, it is revealed that the theory is plagued by ghost-like scalar instabilities in the range of parameters which would render it power-counting renormalizable, that cannot be overcome by simple tricks such as analytic continuation. Implementing a consistent flow between the UV and IR limits seems thus more challenging than initially presumed, regardless of whether the theory approaches General Relativity at low energies or not. Even in the phenomenologically viable parameter space, the tensor sector leads to additional potential problems, such as fine-tunings and super-luminal propagation.
Bogdanos Charalampos
Saridakis Emmanuel N.
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