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| quote: | Originally posted by King_Mack
njizer,
can you explain in a bit more detail in regards to mutiverses, and why you cant travel back to your original Universe? Im not trying to beat the dead horse, im just curious about this notion thats all. I always thought theoretical physicists say "you cant change the past" due to an overwhelming moral issue and the fact that one change in a universe will ripple onto other ones as well. The topic of multiverses is a bit complex, even when trying to explain to someone about the Grandfather Paradox hehe but I havent come across an explanation as to why going back to your original universe is impossible. |
Well, according to Hawking, there may be two possiblities to time travel that would provide resolution to the "you can't change the past" paradox. One he calls the "consistent histories" approach. That theory dictates that even if space-time were so warped so to render time travel possible, the happenings in space time must be consistent to the laws of physics ... meaning that history has already recorded your travel to the past, where no grandfather paradoxes have happened, and where you did not change recorded history. This may be a violation of free will you may say, however, given a grand unified theory that governs everything, it also would determine your actions, therefore free will is illusory. We say we have free will because it is impossible to predict what a person does given its complexity, however, if a person goes back in time we would be able to predict what they did since it is a part of recorded history.
The second theory is the multiverse theory that I guess is somewhat similar to what happened in back to the future 2. However, I think the thoery is that the number of multiverses there are take into account EVERY single possibile history with a set probabilities. Therefore regardless of what actions you decide to take, when you go back, you automatically jump to the appropriate multi-verse whereby what you perceive as actions undertaken by your own free will were predetermined inevitabilities associated with that multiverse. I think he has some other theories as well but I don't know them off the top of my head without hte books in front of me.
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Retro ...
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