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<blockquote data-quote="Ayasano" data-source="post: 79246" data-attributes="member: 4804"><p>Finally, someone who's actually done their research. Many Worlds is an interpretation of Quantum Mechanics, whereas CTCs are a solution to General Relativity, so the two aren't mutually exclusive. The term "world lines" doesn't appear in MW at all, and I don't agree with using incorrect terms when it causes confusion. "Universe" is the word they're looking for, which is fairly unambiguous and well-known, whereas "world line" causes confusion between people using the term correctly, those using it incorrectly and those who don't know of the phrase at all. It might seem like a nitpick, but in a subject as vast as physics, using the correct terminology can avoid a lot of confusion.</p><p></p><p>It's worth pointing out that in MW, time travel isn't the only time new universes are created. Me changing my mind about which words to use in this post would have created several new universes, for example, not to mention the millions of universes created every time an atom decays or doesn't decay. It's also worth pointing out that MW is inherantly unprovable. (Though not unfalsifiable as some assert, when you take into account time travel) Take the classic example of going back and killing your own grandfather. I can currently think of 6 different possible outcomes. (7 if you experience #6 from the point of view of doing the deed yourself, but I feel that it would play out like #1 from your perspective)</p><p></p><ol> <li data-xf-list-type="ol">You go back and kill your grandfather. You live out your life and observe that you're never born. It's possible that you're in a new universe, but this outcome can also be explained by a single universe where a change in the past overwrites the future.</li> <li data-xf-list-type="ol">You go back and kill your grandfather. You instantly vanish. This outcome can be explained the same way as above, but the universe just has a different method of handling paradox.</li> <li data-xf-list-type="ol">You go back but you can't kill your grandfather. Either you get the wrong person, or he just plain survives through deus ex maxchina. This can be explained by either the chronology protection conjecture, where it's simply impossible to change the past, or one of my personal favourites, a single timeline where the change would overwrite future events and some unhappy time travellers from the future would very much like for you to leave things alone and stop you from changing history.</li> <li data-xf-list-type="ol">You send someone else back to kill your grandfather. Nothing happens. This can be explained the same way as either #1 or #3. In MW, you wouldn't notice a change because the person sent back would end up in the new universe, not you. With a single timeline, if you're still around it means the person you sent back failed for either of the reasons from #3.</li> <li data-xf-list-type="ol">You send someone else back to kill your grandfather. You instantly poof out of existence. Basically the same explanation as #2, just from a different point of view.</li> <li data-xf-list-type="ol">You send someone else back to kill your grandfather. Next thing you know, no one remembers you. Someone else is living in your house. Someone else is doing your job. You've been erased from history but are somehow still around to notice. Same explanation as #1 and #2 but the universe has yet another way of handling paradox.</li> </ol><p></p><p>It's worth noting that I believe #3/4 is the way things would play out, although I won't know for sure until I get the chance to test it.</p><p></p><p>To answer your last few questions, I don't own a time machine. If I did, I wouldn't be risking blowing my cover by posting on a forum that allows non-time-travellers access to it. (Unless I was sent back specifically to help/misdirect)</p></blockquote><p></p>
[QUOTE="Ayasano, post: 79246, member: 4804"] Finally, someone who's actually done their research. Many Worlds is an interpretation of Quantum Mechanics, whereas CTCs are a solution to General Relativity, so the two aren't mutually exclusive. The term "world lines" doesn't appear in MW at all, and I don't agree with using incorrect terms when it causes confusion. "Universe" is the word they're looking for, which is fairly unambiguous and well-known, whereas "world line" causes confusion between people using the term correctly, those using it incorrectly and those who don't know of the phrase at all. It might seem like a nitpick, but in a subject as vast as physics, using the correct terminology can avoid a lot of confusion. It's worth pointing out that in MW, time travel isn't the only time new universes are created. Me changing my mind about which words to use in this post would have created several new universes, for example, not to mention the millions of universes created every time an atom decays or doesn't decay. It's also worth pointing out that MW is inherantly unprovable. (Though not unfalsifiable as some assert, when you take into account time travel) Take the classic example of going back and killing your own grandfather. I can currently think of 6 different possible outcomes. (7 if you experience #6 from the point of view of doing the deed yourself, but I feel that it would play out like #1 from your perspective) [LIST=1] [*]You go back and kill your grandfather. You live out your life and observe that you're never born. It's possible that you're in a new universe, but this outcome can also be explained by a single universe where a change in the past overwrites the future. [*]You go back and kill your grandfather. You instantly vanish. This outcome can be explained the same way as above, but the universe just has a different method of handling paradox. [*]You go back but you can't kill your grandfather. Either you get the wrong person, or he just plain survives through deus ex maxchina. This can be explained by either the chronology protection conjecture, where it's simply impossible to change the past, or one of my personal favourites, a single timeline where the change would overwrite future events and some unhappy time travellers from the future would very much like for you to leave things alone and stop you from changing history. [*]You send someone else back to kill your grandfather. Nothing happens. This can be explained the same way as either #1 or #3. In MW, you wouldn't notice a change because the person sent back would end up in the new universe, not you. With a single timeline, if you're still around it means the person you sent back failed for either of the reasons from #3. [*]You send someone else back to kill your grandfather. You instantly poof out of existence. Basically the same explanation as #2, just from a different point of view. [*]You send someone else back to kill your grandfather. Next thing you know, no one remembers you. Someone else is living in your house. Someone else is doing your job. You've been erased from history but are somehow still around to notice. Same explanation as #1 and #2 but the universe has yet another way of handling paradox. [/LIST] It's worth noting that I believe #3/4 is the way things would play out, although I won't know for sure until I get the chance to test it. To answer your last few questions, I don't own a time machine. If I did, I wouldn't be risking blowing my cover by posting on a forum that allows non-time-travellers access to it. (Unless I was sent back specifically to help/misdirect) [/QUOTE]
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