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Regarding the logic of time travel.
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<blockquote data-quote="Ayasano" data-source="post: 79247" data-attributes="member: 4804"><p>The view I personally take is that when you turn on the time machine it will simply break before you can go back, or some other event will stop you from meeting yourself. You could only go back and meet yourself if you remember meeting your future self in the first place.</p><p></p><p>Now, the reason it breaks can be one of two things:</p><ol> <li data-xf-list-type="ol">The chronology protection conjecture is correct and it's simply impossible to change the past.</li> <li data-xf-list-type="ol">Changing the past would erase the existing future like in your example and replace it with a new one. Time travellers from that future would like very much not to be erased and sabotage your machine.</li> </ol><p>#1 is simpler but I like the idea that history is full of time travellers making sure other time travellers don't screw with history.</p><p></p><p>However, this doesn't mean you can't use time travel for fun and profit. You can't change a <em>known</em> event. That is to say, if you have no recollection of meeting yourself on that day, you can't go back and meet yourself, but you <em>can</em> go back and talk to someone else. Just don't try and reveal time travel to the world because unless you remember that happening, the people from further Up will just show up and shut you down as soon as you try it.</p><p></p><p>Note that paradox is avoided altogether regardless of which reason is correct. #1 is obvious, but in #2, how would the people stopping you know that you were going to erase them if you hadn't done it yet?</p><p></p><p>The answer is that you have to think in four dimensions. They know because all of history is already written, including all of the people going back and forth trying to change events and being stopped. It's just that nobody <em>knows</em> about all of history.</p><p></p><p>Let's say you have 3 people, A, B and C. A wants to go back and meet himself, thereby changing history and erasing C, born far in the future, from existence. A's time machine is blown up by C before he can turn it on, which B witnesses, but B knows that there's no way C could have known about the machine without being told. So B goes and tells C about the machine, at which point C goes back in time and blows it up, thus fulfilling the stable time loop.</p><p></p><p>Does your head hurt yet? And that's just a simple example of a stable time loop.</p></blockquote><p></p>
[QUOTE="Ayasano, post: 79247, member: 4804"] The view I personally take is that when you turn on the time machine it will simply break before you can go back, or some other event will stop you from meeting yourself. You could only go back and meet yourself if you remember meeting your future self in the first place. Now, the reason it breaks can be one of two things: [LIST=1] [*]The chronology protection conjecture is correct and it's simply impossible to change the past. [*]Changing the past would erase the existing future like in your example and replace it with a new one. Time travellers from that future would like very much not to be erased and sabotage your machine. [/LIST] #1 is simpler but I like the idea that history is full of time travellers making sure other time travellers don't screw with history. However, this doesn't mean you can't use time travel for fun and profit. You can't change a [I]known[/I] event. That is to say, if you have no recollection of meeting yourself on that day, you can't go back and meet yourself, but you [I]can[/I] go back and talk to someone else. Just don't try and reveal time travel to the world because unless you remember that happening, the people from further Up will just show up and shut you down as soon as you try it. Note that paradox is avoided altogether regardless of which reason is correct. #1 is obvious, but in #2, how would the people stopping you know that you were going to erase them if you hadn't done it yet? The answer is that you have to think in four dimensions. They know because all of history is already written, including all of the people going back and forth trying to change events and being stopped. It's just that nobody [I]knows[/I] about all of history. Let's say you have 3 people, A, B and C. A wants to go back and meet himself, thereby changing history and erasing C, born far in the future, from existence. A's time machine is blown up by C before he can turn it on, which B witnesses, but B knows that there's no way C could have known about the machine without being told. So B goes and tells C about the machine, at which point C goes back in time and blows it up, thus fulfilling the stable time loop. Does your head hurt yet? And that's just a simple example of a stable time loop. [/QUOTE]
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Regarding the logic of time travel.
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