Covariant Ether Theories: Part I
The present paper defines ?covariant ether theories? as all space-time theories that are alternative to special relativity theory (SRT), but nevertheless satisfy the general relativity principle. A general analysis of the properties of admissible space-time transformations shows that the number of such ?covariant ether theories? is infinite, and that all these theories are indistinguishable from SRT with all experiments in space-time physics reported to date.