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Philosophy, Metaphysics & the Afterlife
If the Universe Spun
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<blockquote data-quote="denbo88" data-source="post: 25340" data-attributes="member: 428"><p><strong>Re: If the Universe Spun</strong></p><p></p><p>Starlord, </p><p>Like I said, "..hurricanes, planets, GALAXIES and quasars" spin, but the net effect when all are totaled up is zero; its a wash. So the universe expands, but does not spin.</p><p>I just finished chapter 5 of <u>Parallel Worlds</u> and was disappointed by it. Basically, it lays out how Einstein's theory linking space and time into an inseparable unity and provides solutions various people have proposed to parts of Einstein's theory. "As a result, any wormhole that connects two distant points in space might also connect two distant points in time. In other words, Einstein's theory allows for the possibility of time travel". But Einstein was worried about the possibility of the "river of time" bending back on itself.</p><p> </p><p>Two of several solutions Kaku discusses to Einstein's equations that permitted time travel: The first was W.J. Van Stocum's "spinning cylinder". "It would drag the fabric of space-time along with it, much like molasses is dragged along with the blades of a blender". As you made a complete trip around the cylinder, you could actually go back in time, returning before you left.</p><p> </p><p>Then he discusses Kurt Godel's solution to Einsteins equations. </p><p>"He (Godel) assumed that the entire universe was rotating" (Which we know it doesn't so I don't see the validity to his theory). But if it did, "..every event in any time period can be visited, no matter how distant in the past. Because of gravity, there is a tendency for Godel's universe to collapse on itself. Hence, the centrifigal force of rotation must balance this gravitational force. In other words, the universe must spin above a certain speed. For a universe our size, Godel calculated that it would have to rotate once every 70 billion years, and the minimum radius for time travel would be 16 billion light-years. To travel back in time, however you would have to travel just below the speed of light".</p><p> </p><p>So as I see it, if time travel is possible only in a <u>spinning</u> universe, and the universe is <u>not</u> spinning, either time travel is not possible or something else equally as massive is spinning around it, like "Dark Matter" to cause this effect that we calculate/theorize in a spinning universe. An analogy might be an amusement park ride where you are spun around the perimeter of the ride and feel the centrifigal force. But imagine a ride where you are stationary but the <u>perimeter</u> spins instead. The force is still there but you are not positioned to feel it's effects. The dark matter, would be the perimeter mass. Could it cause the time travel effect as the spinning universe?</p></blockquote><p></p>
[QUOTE="denbo88, post: 25340, member: 428"] [b]Re: If the Universe Spun[/b] Starlord, Like I said, "..hurricanes, planets, GALAXIES and quasars" spin, but the net effect when all are totaled up is zero; its a wash. So the universe expands, but does not spin. I just finished chapter 5 of [u]Parallel Worlds[/u] and was disappointed by it. Basically, it lays out how Einstein's theory linking space and time into an inseparable unity and provides solutions various people have proposed to parts of Einstein's theory. "As a result, any wormhole that connects two distant points in space might also connect two distant points in time. In other words, Einstein's theory allows for the possibility of time travel". But Einstein was worried about the possibility of the "river of time" bending back on itself. Two of several solutions Kaku discusses to Einstein's equations that permitted time travel: The first was W.J. Van Stocum's "spinning cylinder". "It would drag the fabric of space-time along with it, much like molasses is dragged along with the blades of a blender". As you made a complete trip around the cylinder, you could actually go back in time, returning before you left. Then he discusses Kurt Godel's solution to Einsteins equations. "He (Godel) assumed that the entire universe was rotating" (Which we know it doesn't so I don't see the validity to his theory). But if it did, "..every event in any time period can be visited, no matter how distant in the past. Because of gravity, there is a tendency for Godel's universe to collapse on itself. Hence, the centrifigal force of rotation must balance this gravitational force. In other words, the universe must spin above a certain speed. For a universe our size, Godel calculated that it would have to rotate once every 70 billion years, and the minimum radius for time travel would be 16 billion light-years. To travel back in time, however you would have to travel just below the speed of light". So as I see it, if time travel is possible only in a [u]spinning[/u] universe, and the universe is [u]not[/u] spinning, either time travel is not possible or something else equally as massive is spinning around it, like "Dark Matter" to cause this effect that we calculate/theorize in a spinning universe. An analogy might be an amusement park ride where you are spun around the perimeter of the ride and feel the centrifigal force. But imagine a ride where you are stationary but the [u]perimeter[/u] spins instead. The force is still there but you are not positioned to feel it's effects. The dark matter, would be the perimeter mass. Could it cause the time travel effect as the spinning universe? [/QUOTE]
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