Straight out of science fiction: Physicist discovers that paradox-free time travel is mathematically possible

submitted by Drewski from rt.com

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[–]Intuit 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (2 children)

The concept of time travel is flawed. If you can travel in time, then time is just another physical dimension. But then to be able to move in that dimension, you need another dimension of time. It's also flawed in that it posits that in every moment of time there is a copy of the universe. Time is really just a way or organizing change in a system. The past doesn't exist. There aren't infinite copies of the universe in various states.

[–]TheJamesRocket 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

It's also flawed in that it posits that in every moment of time there is a copy of the universe.

Not quite. That supposition comes from a particular interpretation of quantum mechanics, which most call the Many Worlds Theory. This is a very controversial position among scientists.

[–]Intuit 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I'm not even talking about indeterminism. A classical universe with time travel still posits infinite copies of the universe existing all at once for every moment of the past (and future).