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<blockquote data-quote="scriven" data-source="post: 2151420" data-attributes="member: 15929"><p>If I understand your argument correctly, you're saying that if an</p><p>object interacts with a future version of itself, the future version's</p><p>past doesn't include the interaction. What the link shows is that</p><p>that's not true in a universe where time travel takes place via the</p><p>closed time-like curves of general relativity.</p><p></p><p>Consider the wormhole example from the link:</p><p></p><p><a href="http://plato.stanford.edu/entries/time-travel-phys/#6" target="_blank">http://plato.stanford.edu/entries/time-travel-phys/#6</a></p><p></p><p>We have a wormhole with two mouths, 1 and 2. Anything entering mouth</p><p>1 emerges from mouth 2 at an earlier point in time.</p><p></p><p>A spherical ball approaches the wormhole. A future version of itself</p><p>emerges from mouth 2, on a collision course. The two strike, sending</p><p>the later version careening away and the earlier version into mouth 1.</p><p>The ball which enters mouth 1 emerges from mouth 2 before the</p><p>collision took place -- and sees a younger version of itself</p><p>approaching on a collision course...</p><p></p><p>The point is that the ball which emerges from mouth 2 has interacted</p><p>with its past self. There is no ball-0 that never interacts with a</p><p>future version of itself.</p></blockquote><p></p>
[QUOTE="scriven, post: 2151420, member: 15929"] If I understand your argument correctly, you're saying that if an object interacts with a future version of itself, the future version's past doesn't include the interaction. What the link shows is that that's not true in a universe where time travel takes place via the closed time-like curves of general relativity. Consider the wormhole example from the link: [url]http://plato.stanford.edu/entries/time-travel-phys/#6[/url] We have a wormhole with two mouths, 1 and 2. Anything entering mouth 1 emerges from mouth 2 at an earlier point in time. A spherical ball approaches the wormhole. A future version of itself emerges from mouth 2, on a collision course. The two strike, sending the later version careening away and the earlier version into mouth 1. The ball which enters mouth 1 emerges from mouth 2 before the collision took place -- and sees a younger version of itself approaching on a collision course... The point is that the ball which emerges from mouth 2 has interacted with its past self. There is no ball-0 that never interacts with a future version of itself. [/QUOTE]
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