2013/10/31 by Ted Jacobson · 1 citation
Physics and Astronomy · #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.89.081501
5 pages; v2: added discussion of inferences from the general form of the action, changed normalization of expansion coupling coefficient to simplify formulas, nearly coincides with PRD version
arxiv created 2014/03/23 · arxiv updated 2015/06/17
We show that Hořava gravity can be obtained from Einstein-aether theory in the limit that the twist coupling constant goes to infinity, while holding fixed the expansion, shear and acceleration couplings. This limit helps to clarify the relation between the two theories, and allows Hořava results to be obtained from Einstein-aether ones. The limit is illustrated with several examples, including rotating black hole equations, PPN parameters, and radiation rates from binary systems.