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Originally Posted by ripTDR
Another one is wormholes. Lets say we can create one. Where do you create it to? How do you know where the destination opening is? How can you make it open relative to where you are were you make it go where you want?
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Another problem with FTL is the whole idea of causality.. basically going faster than light breaks it and makes it easy to create paradoxes. What happens if you create a paradox? Does the universe prohibit actions which can lead to paradoxes simply with its basic structure (i.e. prohibiting FTL travel)?
Anyway on the idea of wormholes, I did read once the idea that causality problems with them could be avoided by wormhole "ends" have to start out at the same place in spacetime and then you'd have to drag one end out to where you'd want to go at conventional sub-light speeds. Then once there if you traversed the wormhole from point A to B at FTL or even instantaneous speeds because you're visiting the destination in your origin's frame of reference causality is safe.
I have no idea if that actually works math wise.. what happens if you had multiple wormholes starting in different places could you still arrange things to violate causality? It was interesting though.