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Comment on "Scalar Einstein-Aether theory" (1405.6351v2)
Published 25 May 2014 in gr-qc and hep-th
Abstract: A paper studies a modification of Einstein-aether theory in which the aether vector is restricted, at the level of the action, to be the gradient of a scalar. In this comment we note that this scalar version of Einstein-aether theory is equivalent to the projectable version of the IR limit of Ho\v{r}ava gravity when the potential for the scalar is constant. This provides a generally covariant formulation for projectable Ho\v{r}ava gravity.
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