If there was giong to be a time machine...couldn't we possibly already know about it? Kind of?

Question

Unless the built it in 3000 and they went back to 2999.

But if they could make something awesome that took you back like 1000 years...

What do you think?

Answer 1

You wouldn't know about it as if the time travelers told anyone in the past about it, it would disrupt the whole time-space continuum...duh.

Answer 2

Probaley not, they wouldn't tell us. Haven't you ever seen Back to the Future. You could mess up the space-time continuium.

Answer 3

If time travel were possible, and I don't think it is, one theory says you can only go back to the time the machine was first turned on, or when it was first discovered how.

One of the big factors that no one seems to consider is if you were able to time travel in your own time-line, you can travel to any point in time, including 1 Planck time (10e-43 seconds). What would happen then? Would there be 2 of you occupying the same space at the same time. Not a very good plight when your molecules and atoms become entangled.

Now, for alternative time lines. Some physicists believe time-travel between alternative time-lines is theoretically possible in Hugh Everett's many-worlds interpretation of quantum physics, but would require the energy of a star. If you ascribe to this interpretation, you would not travel back into your own past, but into the past of an alternate space-time continuum. How you would get back is any-body's guess.

In any case, there is one issue I don't see how you can avoid. For time travel to work would necessitate the instantaneous transfer of all the quantum elements of ones body to the selected time-line To do otherwise, would cause ones matter be smeared out between time-lines.

Take the idea of using a wormhole. Say you stand at the threshold of the wormhole then advance 0.5 cm. Part of your body is in st1 (space-time region), and the rest in st2. Where are you, and when?

There are just to many variables to factor in to make it feasible. Of course, I could be wrong.