Aether theories which are experimentally indistinguishable from SR.

[Ich]

Yes, I know this paper. But I admit that I stopped reading when they started to talk about "a relativistic velocity space, which they mapped onto
a unit disk with hyperbolic geometry". I´m simply too lazy for such things.
There´s http://arxiv.org/PS_cache/math-ph/pdf/0506/0506041.pdf" that might interest you.

 

[clj4]

Yes, I know this paper. But I admit that I stopped reading when they started to talk about "a relativistic velocity space, which they mapped onto
a unit disk with hyperbolic geometry". I´m simply too lazy for such things.
There´s http://arxiv.org/PS_cache/math-ph/pdf/0506/0506041.pdf" that might interest you.

Thank you, this one is even tougher. The Europeans don't mince words when it comes to math.