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2010

Lessons from the decoupling limit of Horava gravity

Kimpton, Ian, Padilla, Antonio

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We consider the so-called "healthy" extension of Horava gravity in the limit where the Stuckelberg field decouples from the graviton.

We verify the alleged strong coupling problem in this limit, under the assumption that no large dimensionless parameters are put in by hand.
This follows from the fact that the dispersion relation for the Stuckelberg field does not have the desired z = 3 anisotropic scaling in the UV.
To get the desired scaling and avoid strong coupling one has to introduce a low scale of Lorentz violation and retain some coupling between the graviton and the Stuckelberg field.

Lessons from the decoupling limit of Horava gravity · Around

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