Answers are grounded in this paper and cite their sources.
The requirements for stability of a Lorentz violating theory are analyzed. In particular we conclude that Einstein-aether theory can be stable when its modes have any phase velocity, rather than only the speed of light as was argued in a recent paper.
No takes yet. Share an insight, caveat, or question.
Donnelly et al. (2010) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: