Extended Horava gravity and Einstein-aether theory
arXiv:1001.4823 · doi:10.1103/PhysRevD.81.101502 10.1103/PhysRevD.82.129901
Abstract
Einstein-aether theory is general relativity coupled to a dynamical, unit timelike vector. If this vector is restricted in the action to be hypersurface orthogonal, the theory is identical to the IR limit of the extension of Horava gravity proposed by Blas, Pujolàs and Sibiryakov. Hypersurface orthogonal solutions of Einstein-aether theory are solutions to the IR limit of this theory, hence numerous results already obtained for Einstein-aether theory carry over.
4 pages; v.2: references updated, minor editing, matches version in PRD; v.3: typo fixed in Eq. (10)