Comment on "Scalar Einstein-Aether theory"
General Relativity and Quantum Cosmology
2014-06-13 v2 High Energy Physics - Theory
Abstract
A recent 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.
Keywords
Cite
@article{arxiv.1405.6351,
title = {Comment on "Scalar Einstein-Aether theory"},
author = {Ted Jacobson and Antony J. Speranza},
journal= {arXiv preprint arXiv:1405.6351},
year = {2014}
}
Comments
2 pages, reference added