[Spaceships] Real Life Non-Super Science Reactionless Engines

[Agemegos]

Originally Posted by malloyd

Can you? If you have a special frame (and hence can define an absolute clock, the one that runs in it) aren't space-like and time-like intervals cleanly separated?

Well, they can be if the other frames of reference use the special frame to synchronise their clocks, but then the Principle of Simultaneity won't hold in any frames except the privileged ones (ie. c won't be invariant, with odd implications for Maxwell's Equations). If the synchronisation of clocks within each frame is still done by the procedure that defines the frames of reference in Special Relativity then simultaneity is still variant between frames. If you take the latter approach dynamics will still be well-behaved; if you take the former I think the description of basic mechanics would become very involved: certainly electromagnetism would.