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Philosophy, Metaphysics & the Afterlife
If the Universe Spun
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<blockquote data-quote="Harte" data-source="post: 25347" data-attributes="member: 443"><p><strong>Re: If the Universe Spun</strong></p><p></p><p><div class='quotetop'>QUOTE(\"denbo88\")</div></p><p> </p><p>The whirlpools you mention here do not correspond to solar systems and galaxies. These eddies correspond to areas of extremely high gravity caused by supermassive hyperdense objects like black holes (though the centers of many galaxies no doubt contain black holes massive enough for the frame dragging effect). The whirlpools are whirls in the fabric of spacetime itself, like the "frame dragging" in W.J. Van Stocum's "spinning cylinder" you spoke of in an earlier post.</p><p> </p><p>This is why I said in my previous post that the universe is made of spacetime, not matter. There exists a fundamental unanswered question about whether the universe would still exist if all the matter were removed. To get around this, let us imagine that all matter in the universe except our solar system was somehow removed. In this case the universe would still exist, it would just be mostly empty. This is what I mean by "the universe is made of spacetime..."</p><p> </p><p><div class='quotetop'>QUOTE(\"denbo88\")</div></p><p> </p><p>What I tried to say in an earlier post is that according to your post, Godel's theory never says that time travel is impossible in a non-spinning universe. According to what you posted, Godel's theory says that time travel is possible in a spinning universe. Are we to assume that this also means it's impossible in a non-spinning universe? You have not said so.</p><p> </p><p>As far as questions about a rotating universe, rotation of the universe means the entire universe. That means the spacetime too must rotate. There is no center to rotate around. Therefore in a rotating universe, no matter from which point in the universe you are observing, it would seem that the entire universe was rotating around you. You would seem to be the center, just as each point observes the rest of the universe rushing away from it's position in an expanding universe.</p></blockquote><p></p>
[QUOTE="Harte, post: 25347, member: 443"] [b]Re: If the Universe Spun[/b] <div class='quotetop'>QUOTE(\"denbo88\")</div> The whirlpools you mention here do not correspond to solar systems and galaxies. These eddies correspond to areas of extremely high gravity caused by supermassive hyperdense objects like black holes (though the centers of many galaxies no doubt contain black holes massive enough for the frame dragging effect). The whirlpools are whirls in the fabric of spacetime itself, like the "frame dragging" in W.J. Van Stocum's "spinning cylinder" you spoke of in an earlier post. This is why I said in my previous post that the universe is made of spacetime, not matter. There exists a fundamental unanswered question about whether the universe would still exist if all the matter were removed. To get around this, let us imagine that all matter in the universe except our solar system was somehow removed. In this case the universe would still exist, it would just be mostly empty. This is what I mean by "the universe is made of spacetime..." <div class='quotetop'>QUOTE(\"denbo88\")</div> What I tried to say in an earlier post is that according to your post, Godel's theory never says that time travel is impossible in a non-spinning universe. According to what you posted, Godel's theory says that time travel is possible in a spinning universe. Are we to assume that this also means it's impossible in a non-spinning universe? You have not said so. As far as questions about a rotating universe, rotation of the universe means the entire universe. That means the spacetime too must rotate. There is no center to rotate around. Therefore in a rotating universe, no matter from which point in the universe you are observing, it would seem that the entire universe was rotating around you. You would seem to be the center, just as each point observes the rest of the universe rushing away from it's position in an expanding universe. [/QUOTE]
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