Quote (BaconLord @ 10 Apr 2010 14:33)
If your future self tells you to alter something in the present, and you do so, would that future self ever have existed to tell you to change something?
Here's the logic:
Future self comes, says change something
You change it
that future self never existed, so it never came
????
Profit?
Experience has tell us that the "logic" doesn't always work in all situations.
You can see Quantum Mechanics and apply your "logic" ( in the sense of "what we see in the macroscopic world everyday" ). Also try to apply that "logic" in a situation when you move at v=c or when you're in a strong gravity field, or when you have rotations of a thing that its behaviour belong to Su(2) group, instead the rotations under SO(3).
Then you will see that the fact that we "see" how the world is, in our daily experience of macroscopic world, doesn't mean that the world is so in all situations; we see a particular case, when density of energy is low, speed of objects is low compared with c, quantum efects are not apreciable and so on.
So trying to follow a "logic" way, when you're considering an anomalous situation, will give a false conclusion.
There are some ideas about closed time curves, and it's possible in theory, but I think we need an advance in the theory/experiments to explain it with precission.
Edit: By the way, travelling to the future is quite easy, it's made by each particle acelerator everyday. Some particles have a known half life time. When you make them move nearly to V=c, their half life time is increased, so they live more than they do = travel to future.
This post was edited by nAc_LOvEs_mArYjAnE on Apr 21 2010 07:14am