Physicists Theorize New Method for FTL Travel

[Demystifier]

No, red line just shows 1 example of a timelike loop. Timelike loop region contains infinitely many different timelike loop trajectories, including intersecting trajectories.

So red like is just an example of one of them.

Green line shows that he entered that area, then it depends on his decision what to do (so it did not show what happened next to him).

Show me the whole green line (or at least a much larger part of it) because otherwise I cannot see that there exists any consistent green line at all! I want to see that the green line can make a loop (or something like that) in a consistent way.

 

[Dmitry67]

Ok, so the spaceship finishes a loop, sees his own 'old' copy and commits suicide hitting the singularity.

 

[Demystifier]

Fine, that's consistent!

 

[Mr. Paradox]

Wait so if you are in a time loop than how can you leave the loop if time repeats itself?

 

[Dmitry67]

Check the diagram
After you complete a loop, you end at the same time, but slighlty different position in space. Hence you don't need to repeat all you did before, you can do something different

 

[Demystifier]

Check the diagram
After you complete a loop, you end at the same time, but slighlty different position in space. Hence you don't need to repeat all you did before, you can do something different

This can also be rephrased as follows. You do two different things at the same time, but you also do them at two different positions in space, which makes it consistent.

 

[Dmitry67]

I've realized (and now I remember, I read somewhere about it before) that if there is a closed time-like loop (like the one I drew) then it is possible to go back in time just orbiting around the naked singularity (that is why physicists are so afraid of naked kerr rings?) - at least to the moment of the formation of the naked singularity.

In other words, if there is a closed time-like loop, the causality paradoxes (even we agree with the Demistifier that these paradoxes are not real) "leak" outside of that loop to the whole Universe.